BBR kits are excellent quality, as are their hand builts. I've always used
www.grandprixmodels.co.uk as suppliers, but I'm sure they are available other places as well. If you want to do Ferrari F1 cars I'd go to Tameo instead, but for any others BBR are fine.
Good tips for their rather easteric glazing system can be found at
www.amazing43.com. Personally I've never had a problem with the system, but I know wome people don't get on with it and prefer vacformed glazing.
As for AMR, whilst I never built any of his kits I have seen them built and he will be sadly missed, as will PM. Many of you will probably know that I had planned to use them to build this years Le Mans grid, a plan that was saddly ruined by their demise.