Sorry about that Joe, hopefully we can recover the videos, they were very helpful. If not, we'll see what we can do to correct this
1st off -you need to go to one of the larger HD stores as they don't all keep screening materials on the sales floor at thuis time of year. (avoid the Freeport store for sure)
IIRC you have a 120?
You need to be able to make 2 individual square covers, so you need 8 of the corner pieces and enough of the long metal edging pieces to cut 8 strips approx 23" long (do measure that when you are working the cover).
I believe each 'length' they sell is 6 foot long, so you will need 3 of them.
Don't forget the spline and spine tool!! 1 package of spline is plenty, be sure to get the size spline that matches the edging you buy.
The netting doesn't come from HD - it comes from Ace Hardware and is found with the Pond products (which they do have out at thus time if year, though all Ace stores don' carry pond products...). You definitely want the kind with the SMALLER 'holes', they should look about 1/4 " across. The smallest piece they sell is 11 x 11 foot and costs about $12 or so.
When measuring for the build remember to deduct the size of the corner pieces from the length of edging and do dry fit the cover as you go along. It should sit just 'inside' that lip of the frame on a 120 AGA tank.