Sounds like a very ambitious project. Are you a good enough "machinist" type of do-it-yourselfer to make this stable/strong enough? My biggest concern is how stable the enlarger head and printing base are relative to each other and will your design actually give you the stability you will need.
My 8 x x10 enlarger is an old 8 x 10 Kodak 2D camera with a cold light head pushed up against the ground glass. I found the cold light head (a 10 x 10 Durst) somewhere for a couple of hundred bucks. It sits on the counter in my darkroom on a simple horizontal track I built and project it onto the wall. I haven't made prints larger than 16 x 20 before, but no reason I can't make them as large as you are wanting to do.
Your project seems pretty complicated for something you might not use very often. But, it also sounds like it could be a lot of fun building it.
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