It's doable I think. I've seen PDR guys using something similar on Dealer Lots and that was outdoors. But I must digress they are usually just doing spot repairs and not full re-paints.
There are other models on the 'net made more for working in than hosting a party. Anchoring it inside on a concrete floor would be my first concern.
26'x16' is mighty roomy.
Thoughts and comments expressed by me are mine based on my own experience and research and shared here freely. I am not a professional nor make any claim to be as such