I am in the process of designing a lathe bed in my cad software. Right now I have a basic footprint down to 24"X6.5". I have drawn up a base that would be relatively simple construction. I will model with linear slides as well as a replacement spindle for the 7X14 lathe. I will basically design the headstock just like the 7x14 except make it higher, and with a variable speed DC motor and tachometer.
I am still considering bracing inside of the base. The top is 1" thick in the model but I thought either welding ribs in the bottom or possibly filling it with sand to dampen vibration.
I will post with any progress I make over the long weekend.