CorSec Engineering have released a 15mm to 6mm artillery conversion template.
From their announcement:
CorSec Engineering is now offering our 6mm Artillery Template.
Convert your favorite game from 15mm to 6mm. Designed using a scale conversion of 1 inch = 1cm. This allows for an easy to use conversion. Get out your old 6mm army or but a new one for 1/10th of the cost of a 15mm army. Great for truly epic battles.
Template includes etching for the following sizes:
- 12cm x 12cm
- 12cm x 6cm
- 6cm x 6cm