Thanks. I'm going to call that beginners luck.
I perforated within the area with a hand drill to make it easy to cut it out. Then used hand files and a hobby knife to file back to the right shape. Glued a sheet of styrene underneath the holes to support the new parts, added another small .5mm to get the right hight to make it sit close to flush. Then used a syringe and putty to clean up the panel gaps (had to convince the local pharmacist I wasn't going to shoot up to buy them).
Rewarding achievement, but I appreciate the newly released Meng kits where the ECS pipes are a modular part that lets you select the correct ones for the appropriate version
4. March, 13:12