Anita, Good ot see you getting started, it is just a shame that you don't have some snow to play in before starting the project, but these Snow Tracs were sold as all terrain so you should be able to drive it on the
"Snow, Muskeg, Rough Terrain!" if you can find any of that stuff in Wales?
On a different topic, one of our members with a military Snow Trac (ex NATO) has some questions, please see this thread:
http://www.forumsforums.com/3_9/showthread.php?t=8124&page=2
Particularly look at posts 29, 37 & 38. Maybe you can do a little historical digging and get an answer for us?