Thanks for the advice guys. My suggestion was to secure the units
first...so I'll reiterate that.

Good points about the extra supports, I'd read a few posts suggesting
this and once the base units are in I'll ask him to baton any gaps
out.

The supplier is doing the templating so I'll also ask them to point
out any areas where extra support is required in case we've missed
anything.

Cheers,
Ant.