futon straps

Hi: I have a thick meshed futon zip cover on my futon (no base covering) and I want to make handles for easy moving. I bought a sturdy strap material and want to make sure I sew it on correctly without the possibility of them tearing. I really wish there was a solution to not sew them on (I'm waiting for a quality used futon frame to become availible, as presently my futon lays on the floor). So: How long should the straps be? Should I put a base material atop, behind and/or inside the sewn area? What kind of thread should I use (i.e. fishing line grade)? Thanks for your help, ny