This is actually old news, but I just wanted to share you pics of advanced mould for 1.5m Hinu (kit nr. 117) cowling. Original mould was too high and it caused all kinds of problems while vacuforming parts. Mainly webbing at the bottom of mould. Success ratio was approx 1 good for 20 tries. So I had to make an better mould.
Second try split mould into 3 parts. Front, top and bottom. All these must be vacuformed separately. There is nothing new in the actual mould making process, it’s just a bit more complicated. I assembled all wooden parts into one block which was sanded to shape and then dismantled. Then over-runs were added and mould was ready. I was making some vac parts couple weeks ago, these pics are from that run. Now success ratio is approx 1 fails for 10 goods. Nice, really nice!