plumbing

OK, thanks for the help so far guys, another question now...

Calorifier arrived this afternoon, a week ahead of schedule (thanks Surejust, no affiliation etc etc), it fits in the space i hoped it would thank frack. There are two hollow flat bits moulded into the grp behind the engine, it looks like it was made just for this type of thing. I need to put something between the two moulded bits to give it something flat to sit on.

Should i use marine ply or something similar? I can't see how i can possibly get nuts/bolts onto the bottom of the bearers, is it an option to use screws and CT1/Tec7?

EDIT:Also, do i need an expansion vessel between the thermostatic mixer and tap?
 
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