No just got on with it Richard, fine as long as you take your time. Roof off , seats out, mark position of bar on rear panel, remove rear panel and speakers, cut rear panel with a hole saw and remove burr.
Refit rear panel, fit bar, refit speakers (sod of a job getting room to fit the screws back). You do need the speakers out to get your hands in for fitting bar bolts. Fit the rear harnesses, fit the straps onto the seats, refit seats and standard belts back and refit roof. I did lubricate the roof seals as these always squeek, jobs a carrot.
I bought the bar second hand, a chap had had it fitted to a V6. I don’t know the make of it.
Seats don’t hit the bar but my legs are short but there is still plenty of notches left.
I fitted the seat belt bolt kit that ad_S suggested, which alters the spacers and gives room for both sets of belts. That was from MSAR and I think is a Sector 111 kit.