Some of our members have them, and an even larger number used to have them, but I've never heard anyone suggest that they are collectible. That may change with time, I suppose: I had trouble for a long time believing anyone would collect 2 stroke Victas.
It is doing a good job for you, so obviously it is worth tidying up. The issue about showroom restoration is that, if you are going to run it into blackberries and bracken, you aren't going to be able to keep it looking truly immaculate. Why not focus on conserving it - that is, bringing it up to top, original operating condition, repairing all cracks properly, removing all rust and protecting it against future rust, but not going the last step of the perfect paint job and new decals?