Hi Jaques,
RE your decals: if you know what the decal originally looked like, or can get someone on here to provide you with a good digital image, you could use Photoshop/Powerpoint to re-create it and the appropriate printer paper to make what you need as a slide-off transfer.
Stephen White has done it in 1/6th scale for the fire extinguishers on his Centurion tank model. Check out the process he used at:
http://www.armortek.co.uk/Forum3b/vi...bb12&start=885
Mike