Side by side comparison of new intercooler and OE one:
https://www.aulro.com/afvb/images/im...014/04/605.jpg
And from above:
https://www.aulro.com/afvb/images/im...014/04/606.jpg
The welding looks a little crude, but it weighs twice as much as the OE item. It is pretty hefty.
This is the crack in the original. Doesn't look much, but I've confirmed it is a crack by filling it with kero. Probably repairable, (but SWMBO gave the go ahead for a new one) but I wanted to fit a new bigger one at some point anyway.
https://www.aulro.com/afvb/images/im...014/04/607.jpg
Been measuring up, and I think the best way to attach it is to manufacture some brackets out of sheet aluminium to attach it to the front of the chassis. It fits inside and below the front crossmember.

