The Interior work will be fine. That will be easy and not as hard as the TT engine part. The NA tranny will work on a TT Engine. You will just need to use the TT Flywheel. If you must know , You can do a search on Na to TT and you will find a goldmine of knowlege to last you for a lifetime. I'm currently doing my swap right now. If your'e crazy enough like me then you could probably do it. I've already gotten all the intercooler piping in and gonna probably drop in the TT engine this weekend. Be ready to spend about 4-5K minimum on just the engine alone. Total cost for me is getting close to about 7K now. Thats just the TT engine and parts alone. Do a search on my SN also, you'll see what I mean.