1st Build, Second machine

[Jonathan]

no where did I suggest useing it prop up a flimsy front plate.!!

This, in my opinion, suggests that:

Put the rails on the front plate and the bearings on the back plate. This way the rails help stiffen the front plate.

Either way obviously I agree that rails on the 'front' is strongest. It's one of a number of things virtually everyone does wrong to start with, myself included. It also reduces the length of material required for the Z-axis. The only disadvantage I can think of is that you're also having to move the stepper motor and screw against gravity ... but that's almost certainly negligible.

Ideally you should also machine a slot in the plate for the rails so that one of them can be clamped in place. The same is true for the bearing blocks. If the machine crashes it helps stop them move out of alignment. I don't know if you have a milling machine though?

Not sure why you felt the need to post that.?

Perhaps there wasn't much point. I thought I was reinforcing/clarifying it.