My 1992 4/4 has rubber seals on the sidescreens. I have just put new ones in as the originals were a bit worse for wear.
The windscreen uprights have a "channel" fitted that this rubber slots into rather than sit tight against the screen frame as there is a curvature in the rubber. I either teaae this curvature out a bit to get it to span the gap or fill the channel out a bit with neoprene. Latter seems easier.
I still haven't got round to photos yet so be patient!
As for sealing other areas...thats a winter time garage job. Thanks again DaveW for the insight into how to tackle it even though each car has its own charactyeristics your ideas are sound and able to be mofidied to suit