Hello, my comments after 2 weeks of building (solo mode, no aircraft carrier)
After 2 weeks I managed to build 12 objects in the system I found in solo mode. I only have T2 and T1 objects, because T3 is a bit too much for me in terms of materials. I played almost every day for 3 to 5 hours, carrying mainly T9 and T8 materials. Suddenly I started to wonder why I do it. I don't see any point in personal colonization, because it comes down to monotonous carrying of materials, without any interaction with the environment. I work, I don't play. I carry materials and I shouldn't complain, because the system I chose has all the resources needed to build an installation in 2 jumps. And what makes me angry? I work for an NPC corporation, with which there is no interaction. I, the player, set systems for NPC corporations, carrying materials as a lone builder... Am I the only one who sees the oddity of this situation? One T9 carries the materials for the entire system, and the profits and connections are collected by an NPC corporation, and we, the players, are then left with a marker on the galaxy map that we were the architects of the system. Passive income from facilities? Players have many ways to make money in Elite and don't need a few credits from the system they so painstakingly built. I have a few billion myself and nowhere to spend it. There are many players who have full credit accounts but nothing in Elite...nothing of their own.
I think we deserve more rewards in the game, and I'm not talking about credits.
I think the first system a player colonizes should have a HQ. For the player's own use. I think Coriolis T2 is perfect for this role. The station should have the ability to store materials outside the market. Don't overdo it with the size of the warehouses, but 10,000 should be enough. What's more, the player in his HQ should be able to block the sale of produced materials on the market for the time of construction and colonization. Blocked materials are only used for construction. They cannot be exported from the system. Finally, on the market, in the HQ station, you can share the materials that the system will produce, and they will only be visible to the architect player in the target colonization system. You don't need carriers with supplies. You can use NPC corporations to pump the market, say once every 24 hours a certain amount of materials for construction. I would even gladly pay for this service. And there is no problem with transporting materials using carriers or ships, as I wrote earlier, these materials are only for construction installations. After building all available space for installations in the colonization system, the possibility of blocking materials disappears and the free market operates. And so, looking at the production rate of materials in my system, I still have to obtain most of them from other systems, because I don't want to wait. But knowing that materials are produced in my system, I can fight for a few days or become a miner and take a break from the boring and tedious flying of T9.
This is just an example. I also think that it makes sense for players to have installations in the system. We can even buy them from the NPC faction in the system we have colonized. We have already put a hell of a lot of time into building them, so we deserve to have them. What I would most like to see is a selection screen right away, with the option to buy/receive the installation.
About the amounts for the T3 building. I think they are exaggerated. But as I have read, several players have built T3 facilities in solo mode and respect for the sacrifice. Personally, I will not do it, just for the pleasure of having a T3 facility for nothing. Until there is a specification of how the facilities affect the system economy, I will not dare. My system currently has 40,300 settlers and the economy is based on agriculture. 12 facilities, including a mine, a factory, a T2 lab, T2 food production, T1 military facilities, T1 orbital mining, and I am still a farmer. As you can see from my example, T2 food production has overshadowed the rest of the production. I will soon finish building an orbital mine, and this may change the economy of my system.
However, I think that was my mistake, because I could have focused on military and security installations (so that the system has a high security rating), and then built one type of building, let's say HighTec, to have a proper economy. I will correct my mistake, because I still have 36 building slots in the system

And listen, I didn't write anything about the constant technical problems of colonization. I had them too, but I still think Frontier is brave in acting on a living organism. We test all this on online servers and we are part of it. Only I personally get annoyed by flying without a solid reward in the form of having your own headquarters and system. After all, it's a piece of cake for Frontier. If players own carriers, why can't they own stations?
What do you think about having colonized systems as your own?
P.S. English is not my native language. If something is written incorrectly, it was not intentional and I apologize in advance.