I'm preparing to build a small astronomical observatory at my home . A rotating dome will rest on an eight-sided, four-foot high structure built conventionally of 2x6's (treated sill plates, standard studs and top plates). The sill plates will be bolted to a concrete pad that will have 30" footers -- an inverted flat-bottom bowl, if you will.
Since I'll have a 2x6 sill plate already, would it be practical to lay some treated 2x4's on their sides and use them as floor joists to support a home-shop-built 3/4" tongue-and-groove mahogany floor? This would have the mahogany 1-1/2" above the concrete base, which itself will be a minimum of 6" above grade. My thinking is that such a floor would keep my feet warmer in winter and also provide open space for running electric wires and data cables to the telescope.
TIA!
Davoud