Great job, love me some Alox Rambler, the best 58mm, too bad it is not officially available (only seriously overpriced).
I found out that the easiest way to do it, is to place the Minichamp on soft wood, then rather than drill, push the pins out into the wood (with a pointy center punch).
This has 2 major benefits:
- no damage to the scales if you are careless with the drill
- You then can remove the top scales and layer by layer (the wood and the bottom-scale holds everything in place) with ease.