Hammers, I can't advise you with specifics, but I used to do something similar with flytying kit for trout flies. The trick I found was to NOT try to take every mortal thing, but to pack tools and materials for a set of particular flies, and work just on them.
The nearest I've done with modelmaking was when I went to stay at my mum's earlier in the year after she'd had an operation. I took my GB plastics, my tool roll (scalpels, files, scrapers etc), some glue and tiny bit of greenstuff, and assembled a pile of plastics.
Small, ad hoc sets of bits for specific tasks would be my best advice.
Hope this helps,
M