First I'm not sure what a Bomideer is You must mean Bomdardier
for the pics check out woodys.com for patterns and the correct amount for your sled, and yes you do need a special drill bit so you don't damage you track. there cheap! 8/9 bucks.
I am nervous about the ice. Last year I saw alot of ice on trails. Last year I was riding my polaris xcr 600. Which has studs (spikes) in the track and I did not slide a bit. The 600 weighs 400 lbs, the skidoo 800 weighs 600 lbs. Just guessing on the weght. Skidoo is much bigger. Would'nt it be a good idea to get the studs in the track?
Its 65 an hour here so i would do it for 40. Try to find the studs cheaper somewhere else cause that is an outrageous price unless your running a 244 setup. Wash out and flip on the ice once without studs and see if you want them first, i learned the hard way and wont ride without them again.