Cheers chaps - My original plan was to build it using a single x-axis screw...see how it goes then add a second at a later date if I feel I need it.

I'm now ditching the FLA-100 as a base design & am starting a new design from scratch with 50mm box.

My local supplier states £4.10/m +VAT as a base price, then depending on quantity it could be cheaper...they also quoted for cutting - 50p/cut as a rough ballpark but cheaper on multiples.

I'll get a bit further with the design & then start a build thread - then you can start ripping my plans apart again ;-)