Huffy Cranbrook frame thickness ?

I'm probably going to use a Huffy Cranbrook as a guinea pig for my first build. If I screw it up at least it won't be an expensive lesson. Anyway I would like to order the DOM tubing asap but don't know what thickness to get. Any suggestions? Or does somebody know the exact thickness that Huffy uses?

Thanks,
Craig

Anyone???

I have the bike here now but haven't chopped it yet. The upper frame tube is 1.250" but I don't know the thickness. I'd rather have the tubing ready to install before cutting so my measurements, etc are fresh in my mind instead of cutting first then ordering the tubing and waiting at least a week to put the frame back together. Can anybody help?

Thanks,
Craig

Sorry I forgot to mention I'm cutting the frame to stretch for a board track replica.