HD offers to rip my 5/8"x4'x8' plywood purchase to either 16" or 24" widths. This way the cut pieces are 1/2 or 1/3rd lighter than a complete sheet but still straddle (3) 2'-0" spaced rafters. Where the cuts took place I'll just butt together again. Butting together again will shrink (2) pieces of 24" width by the amount of one saw kerf or shrink (3) pieces of 16" width by the amount of (2) saw kerfs. Is this of any consequence? Also, I plan to use roofing clips each 4' width total as if I were installing actual unripped 4x8 sheets for thermal spacing. Should I use similar clips between the cut pieces ? for strength? for thermal? or not at all? I'm doing this alone as a challenge to see if I can, other-wise I'd hire two moonlighting roofing pros and let them install the sheathing. The shingles I hope to haul up by breaking the bundles into quantities I can handle and installing over suitable underlayment. Roof slope is 4/12 so I feel reasonably secure. My fall back position is: pro's do the the sheathing and shingling. I'll do the remaining framing, installing vinyl siding, soffit/gable venting, etc.. It's an unheated garage so I see no need for ridge venting. Any comments/suggestions, tips.