Quote Originally Posted by m_c View Post
My plan would be to cast the base, then do the finish machining off the rails once cured.
The other option would be to machine everything prior to casting, then have an internal metal structure to hold everything in alignment, but I'm guessing over a 3-4 foot bed length, there is always going to be some level of movement as things cure.
Suppose it's all down to what machines you have to help with the machining.?