Graham's Brig 28mm

I'm trying to build a drop ship for Rogue Traders to travel between their void ship and to the ground. I drew it up for fun, but I'd like to use it in Kill Team or Warhammer 40k. This model was meant to be able to be taken apart so you can put 28mm figures inside. It is very much still a work in progress. I haven't added tolerance zones yet, so I'm not sure how well things would slide together. There are no guides to attach the parts together yet either, and the wall thickness is a massive 4mm.

I wanted to post this to see if I could get any advice on if the wall thickness is too much, and if something this big is even worth doing on a 3d printer. It measures 650 mm long, 240 mm wide, and 170 mm tall.

It's big enough to take the top off and be able to move characters around inside, the intent was to add furniture as additional files once the exterior was detailed.

The hangar bay / cargo bay doesn't have a door yet, it was originally meant to be big enough for a Tau Hammerhead but it got larger a couple times as I edited things.

I still need to add turrets to the canards on the front, it is meant to have 4, one on the bottom and one on top of the wing.

Any feedback would be greatly appreciated, I'd like to be able to fix it so it's worth printing.

"A brig is a sailing vessel with two square-rigged masts. During the Age of Sail, brigs were seen as fast and maneuverable and were used as both naval warships and merchant vessels." - https://en.wikipedia.org/wiki/Brig

20181017:
-Added keys to attach parts with.5mm tolerance zones.
-Added holes for 8 1" dia. x 1/16" thick magnets so it can be disassembled.

2018110:
-Happy Birthday Marines

20181111:
-Added cockpit furniture
-Added berthing furniture and bulkheads
-Added external sensors array