Hi thanks for the reply

I went with the supported rails due to profile ones being out of my budget

yes they are 1605

i went with that profile as it lined up nicely with the holes in the supported rail, making it easy to join the two.
Sorry i know having no bed and lower frame makes it tricky to check, its just i wanted what i had drawn checking first in case my design is junk.

With regards to mounting the bearing blocks to the gantry sides, do you mean by bolting a plate to the bottom of the gantry side and then the bearings to that, forming like an upside down T shape?

Ok i will make the plate 20mm and remove the rear plate on the gantry. I saw the idea originally on the Sweetdream CNC which did seem like a good idea.

Is there any good reference design on this website i could look at at all?

Thanks again

Trev