This is creepy weird, but I'd been thinking about something very similar recently.
On one of the other threads, someone has been banging on about wanting the panther clipper, and on the wiki it says that it was redesigned with a reduced size closer to the anaconda, but was never implemented.
Now my idea was to re-redesign the panther, make it bigger, like capitol big, maybe also have an imperial variant, ana these would be the ultimate multi role vessels. They would come with fully fitted internals, as no station would have upgrades big enough, 20+ small hard points, same with utility's. These behemoths wouldn't be able to dock or land due to their size so would be fitted with 3 landing pads with hangers, 2 small and 1 medium. Ships would be needed to transfer goods to and from stations or the surface bases, and this could take a while to fill/empty the 5000 ton hold!
In combat it would be a whale acting as support for fighters to reload and repair (as long as materials are on board)
Exploration would have multi crews striking off in their smaller, faster ships to scan entire systems, and of course trade speaks for itself.
In order to buy one you would need elite in all 3 professions, and be stupid rich, I mean billions.
What do you think?