just in the process of building my v3 brumby.
just a few things that can cause problems. need to cout a section out of the cross member for the turbo up pipe, as well as the mentioned chassis rails. the brakes need to be upgraded and to do this the easiest way is to go to crossbred performance (online) and purchase their conversion kit. I am in the process of getting some money together to purchase the kit (~$1100 afaik) gearbox crossmembers need to be adapted (in the process of sorting this out now). There are alot of small problems that need to be sorted, that you find as you go. I decided to jump in the deep end and just sort out the problems as they come. Will let you know how it works out for me ..