I believe your 35 had the same frame and guards as other models. The later 250 's had a different frame more lighter weight. Your guard looks the same as my 1948 rigid nh. I had the same problem as you after blasting it had more holes than a spring vest! And what was left was so thin you could almost see though it. I had a new one from India, it fitted great and was made from a good thickness metal.
1948 NH, BSA D10 SPORTS. 1953 VHA (project)