1/43rd scale Starter resin kit from 1984. These are the instructions; very simplistic even for Starter’s standards.
The resin is very hard, I was concerned it might be brittle too, but fortunately it doesn’t seem to be too fragile. I used CA to fill the pin holes and it’s about as hard as the resin. The windows were fully flashed over and there was too much thickness to the insides of the openings. A Dremel tool and some small chisels worked great for dealing with the thinning out of those areas.
I tried a couple scribers and a few different knife blades before I found one that worked pretty well to scribe in the panel lines. Still a little more clean-up before the first prime.
The rear wing had a bit of a warp/sag and I tried to straighten it with a hairdryer but the hardness of the resin made me think I would break it before getting it to conform the way I wanted. I got about 50% of the sag out and sanded it the rest of the way.
