Still early enough to make some changes I wish I had. The X rails are unsupported. This lets the wobble even though they seem stout. A modification to the base and gantry that gives real benefits is to change the gantry/rails into a one rail likeness of a Joes2006. If you don't do it now, you will be adding sides and supports for the rails (pipes) as an afterthought like I and quite a few others have done. Everything else works out fairly well.