Welcome! I have a Brooklands M3W so I have a specific exhaust problem that you won't be affected by. About the most serious isssue with early models (chassis) I think there are pictures in this forum of cars that are "original", and then with the solutions (bolted / welded) that MMC came up with. One of those that contributed to that particular discussion will no doubt point you to that thread.
Cheers, and have fun!
