Ditto on all the good advice, I've owned Summit, API and now a Timbertall Climbing Treestand and they all are great! Check out http://www.treestand.com they seem to be the online authority on treestands, parts, accessories and advice!
For all the effort and expense you have to go through to make one, why not buy a solidly built Gorilla 49 dollar loc on at Wally World????
Tell you a little story about homemade loc ons. A hunt club member of ours graciously offerred to supply a half dozen bowhunting loc ons one year. A month before the season there we were hanging stands. The member was trimming a few high limbs above the stand for head and bow clearance when all the sudden the platform gave way and he was left hanging from his safety harness.
Trouble was.......low grade bolt mixed into the high grade bolt bin. The bolt sheered off cleanly. Had he not been in safety gear, he would have fell 25 feet.
Wood stands.... Thats just plum crazy anymore given the excellent and affordable options out there.
In the darkness, the hunter stumbles through the underbrush, making noise and leaving his scent seemingly EVERYWHERE!
Daylight will be here in 30 minutes and he wanted to be in the stand an hour before daylight.
"I know I left that stand RIGHT in this area last night," he mutters under his breath, "but where is it now?"
He traipses back and forth in a zig zag pattern, getting himself overheated and sweaty, but never finding the stand he left there the previous evening – and eventually sits on a...