@SuicidalInsanity Thanks for the warm welcome, I'm glad you like the ideas. With the endcaps could I suggest having a thicker version with an airlock for the mk2 size, this I think would be especially useful for mk2 rovers or surface bases. I would suggest the same for the mk3 but I think that would look a bit silly scale wise, perhaps instead a very short mk3-2.5 or 3.75m adapter plates to mount docking rings onto, this is something I could see being very useful for space stations made with mk3 parts. With regard to the long term habitation modules, the ideas you and CptRichardson mention are pretty much what I had in mind,a two deck part with a bunk room/dormitory on the lower deck and some kind of common room/lounge on the upper deck. Maybe something with a few comfy chairs around low tables, a small kitchen and dining area in one corner and maybe a small library/study area in another corner with desk and book case? Perhaps these ideas could be used in the mk2 parts if they were split-up? i.e separate bunk-room and lounge parts. I've also had a few more ideas that might be worth considering; 1. mk2 & mk3 stairs, something like you would see on small private jets or maybe just some kind of hatch opening we could mount the existing ladders to so they would be usable with the hatch open but shielded from the air stream with the hatch closed. 2.mk2 & mk3 six way hub, I think this was suggested before I can't remember if you said it was do-able in the mk2 form factor or not. 3. mk2 & mk3 vertical t hub, basically a hub with two attachment points on the horizontal and one at 90 degrees in the vertical. These I think would be very useful when combined with the other hubs for large stations or multi hulled "mother-ships". Edit: 4. A telescopic extending docking port, similar to the existing in-line ports but with a much longer reach to enable a greater distance to be maintained between a large ship/space plane and a space station. As always feel free to accept or reject these ideas as you see fit, it is your mod after all.