Hello Paranormal, regarding your question. I have been driving the Playseat for about 1 year. Yes you could take it apart completely every time but it is too cumbersome you would have to disconnect all the cables etc. which is possible but not recommended. Too cumbersome from my point of view. Otherwise the seat is ok.
The Sim Rig is compatible with the Thrustmaster T248 as it is designed for all standard steering wheels. There is a separate bracket for the shifter, which you can attach to the side of the frame in the position provided. The exact installation instructions can be found in the instructions supplied or on the manufacturer's website.