First, take everything in the stock ship and throw it all out.
Engineer the stock hull for lightweight or whtlatever you want
Now add:
-A class and G5 engineer your FSD for long range
- ADS/DSC for ligthweight/efficiency
- SRV (*2, Lighter one)
- SLF (great for surface recon and general blowing off boredom)
- few heat sink
- smallest thrusters, D Class (you can't boost, but have zero need for anyway, outside of saving yourself from slamming into a high G surface)
- smalls D Class life support (2 min, 10 min, 20 min, 2 hours....you're going to die anyway so no need in dragging it out!)
- 16 T fuel tank
- 6D to 7A fuel scoop (completely up to you, and won't get into any debate on if one is actually faster than the other)
- smallest power plant that will keep the lights on with the SRV, SLF, AFMU, and Cargo Hatch powered off.
That's it!
AFMU is optional but if you plan on using neutron boosts I would bring one and leave it powered down until you need it. If you must bring two of them, you will have to keep the backup stored in your pocket protector with all of your other nerd stuff.
Shields are not required, nor are any limpets or cargo racks. However, you should try adding them after you've done everything else, and if the impacts to your range are something you can live with, then go for it!