IMHO the real problem is the linear rails / the lack of/ . Best would be to upgrade to Chinese square rails Hiwin type. 20 size best but even smaller size is ok. Like 15 or 12 and use 3 carriages instead of 2, as they are very cheap. Especially the gantry and the Z, its a must if you want to have any resemblance of a proper machine.

If you can not find an easy way to do that, better fabricate what brackets you need for a new machine and sell that one. If money is a problem, don't dilute your attention on pointless parts. You need basic structure with ball screws, square rails and a controller


I have seen recently such a machine like yours / and have had worse/ and honestly 0.8kw spindle is enough for it. Anyways the spindle is a good buy, could be moved on a new machine