rex - if you're really planning on doing it i have some rough wire translations. if you have full car it's not terrible - rear end wiring took a fair time as wires aren't even close to similar colours. i'd get the nearest spec 5 door golf i could.
i had to buy a few parts off ebay as i'd left them in the golf - side airbag ignitors (behind b pillar trim) crash sensors (inside doors on golf) touran doesn't have them. also where i converted to climatronic i needed a 'sun sensor' that fits touran dash (on top centre) and that plugs into golf loom.
there's a few things like airbag plugs different so need chopping off touran loom and soldering to golf loom, golf has tweeters in front door loom where touran has them in the dash
clocks didn't drop straight in, took a bit of shaving to get them into the dash, exhaust is the same all the way through but is longer on the touran around the rear wheel area, all hangers before and after match up but needs extending just before the rear wheel.
front subframe / rack etc is all the same fitment as are struts
the touran fsi pump seems to be a mash up of mk5 and mk4 but you can simply bolt the golf pump pot part to the sender and top of touran pump, you'll need to tend to fuel lines too and fit golf 6.6 bar filter and remove one of the touran return lines from the engine bay (blue)
Bignod00 - thanks bud, people hear the noise and chatter and look around bemused trying to see what that sound was as it certainly wasn't that family wagon
regards badge it's still wearing the 1.6 FSI badge with pride