[Sssingo]

5: The channel will want to kink especially on the tight radius

STEP6: At first I spent hours removing then straightening the kinks with pliers

STEP7: BUT HERES THE HACK! because you are using a cheap bit of work to form around rather than glass you can tap the kinks flat with a hammer. For a clean channel cover with thin cloth first

STEP8: First corners done and holding shape

STEP9:Trial fit to between those first two mounting holes