Plus one on the parts manual being very handy, and the forum for detailed help. I think a lot of the issues relate to mods & adjustments done by a previous owner, so parts book really helps.
That said, bonnet catches may be a good example. The adjustment involves fiddling within the oval shaped mounting holes to get them to work, and not pop up while driving. I have to press the right side down first or they will not seat; I have just got used to this fit. However, my parts manual (illustration BD) appears to be missing a critical part. There are wooden wedge shaped shims placed under the female bonnet catches on the fire wall. The thin part of the wedge is down, thick side up. they are about 1/4" thick or so; can measure them if needed. Does your car still have the wedges? Easily lost or broken. Just a thought, and an example of potential 'missing' part, or perhaps a running change made at the factory?
My bonnet stays down fine on road drives and catches properly. That said, when I tracked the car at Sebring there was so much torsional bending in the body the bonnet popped up repeatedly after my second session and we got the car moving. Racing tape solved the issue for the rest of the day. My instructor (Steve Smith who runs Elan and Ginetta race cars out of Florida) laughed it off while slapping the tape on.
Great fun!
Door fit also difficult. I have mine right now in a compromise position so they work, but the trailing edge of the door sticks out a bit. Has always bugged me, and have spent hours trying to improve things. This is not the same door fit issue as the Elan; the door shape is absolutely correct, it is just difficult to get the catch to work from the door handles if they are flush with the body. It might be that my replacement door seals are too thick, causing outward pressure on the catch and not allowing it to release. I have tried two sets, and still have the issue.
Funny story though. At LOG in Las Vegas Bob Dance and the guy who MC's the events (can't recall his name, but he has worked for Lotus forever and used to work on assembly of the early cars) commented on how good my shut lines were and said the fit was way better than they delivered from the factory!
Charitably put, the fibreglass assemblies are a bit approximate by modern standards.
Brian Buckland book is great, even for Plus 2 types. It does not reference the Plus 2 at all, but the models are similar enough it is a great reference. I got mine from Foster Cooperstein, which is a bit easier than Club Lotus for folks on our side of the pond.