My advice, build as big a space as you can without making your family angry with you.
The issue is always limited space - even with a greenhouse.
With a situation as small as 4X2X2
- I am not sure I would even grow a nepenthes (though they are super rad, and maybe there are smaller ones than the one I have which is easily 3 feet long and would fill up your case with the 1 plant).
Look for miniatures. If you have cooler conditions, I'd go for a Dracula / Masdevallia / Pleurothallid box - put some paphs in there too (maybe on a heat pad depending on the plant). if I had something like you are talking about - no high light required.
if you wanted high light, I'd start looking at miniature cattleya alliance plants (brassavola / cattleya / sophrontis / laelia. Smaller bulbos are a good idea
You could do miltonia / miltoniopsis too. - but they will fill up the space too much and you will want more plants.
My $0.02.
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