Building a small clan dojo in Warframe is achievable for solo players or a small group of players. The highest investment will be over 10 forma. I have two similar layouts you can reuse to have a trading post and all research up and running. Both layouts require you to build a lower floor containing 2 reactor rooms first. Only after you have constructed both reactors you have enough energy for the the rest of the rooms.
Both layout layouts will allow you to build all research labs. The differ in how easy you can extend your dojo.
This layout can be easily extended and will need 13 forma (12 for rooms, 1 for the trading post):
This layout is limited to trading and research and will need only 12 forma (11 for rooms, 1 for the trading post):
If you want to know how to build what in you clan dojo I have done a small youtube series explaining the details.2 People think it's helpful 😀