I think GayBoy drilled mine, I couldn't watch, and I vaguely recall a discussion about how far back I wanted it... ...but then Mr Wood had an awful lot of lager in his utility, and wanted a hand with it the night before, so my memory might not be 100%.....
He had quite a lot of beer in there on the Friday night before the Hampshire meet too

Its a unique room... ...empty it of beer, and it self replenishes 
I reckon Kevin Wood keeps it full so the space cannot be utilised by Mrs KW for shoes and hanbags 
Yes, anyway..
Drilling the 80L take frame mounting holes is a piece of cake. Remove carpet, slide the frame back until it just sits nicely between the two bulges where the spring seats protrude into the boot floor, make sure it's central and the strap adjusters are on the forward side, and drill.

Think you need to drill another pair of holes in the frame at the side, since the other pair are along one of the long edges IIRC.
When drilling the second holes try to arrange them to be clear of the holes in the chassis rail, as you have to fit larger spreaders to cover them otherwise.
Secure with nyloc nuts, and they should be nowhere near tight enough to crush the box section. We're not fitting a tow bar.

Kevin