The biggest problem I've found so far is not having enough of certain screw or too many of a certain screw. Not a problem for me has I have a good few dozen spares of various types. I'm installing the electrics now.
Update: Build is now done, car can be driven now just need to do final setup.
I noticed when I had it on the Hudy station that the slop in the links is much more reduced compared to the TC5. The car is now ready for a few runs, should be interesting. It's mostly kit setup except for 1 compound harder in springs and I went with 2 degrees of negative camber all around.