Don Stephan
Posts: 825
Joined: 2003-07-18
Location: Cincinnati, Ohio
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Check with full service lumber, specialty lumber, or suppliers to cabinet manufacturers. MDF commonly is available 4x8 and 5x10 at these sources, but not at Home Depot and the like. Alternatively, you could certainly biscuit or spline two pieces together, but I would tend to make a veneer two ply to glue over such a joint to minimize the chances of its showing through.
Don't know of a rule of thumb for width of base support. If you have access, check Ernest Joyce's woodworking bible, "The Encyclpedia of Furniture Making". (Editted to refer to the intended book - please excuse my brain burp.) You could also post that question on the Fine Woodworking forum. Someone else here might be able to help with your 2nd question.
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