Well I have a bunch of experience several hours a day over a years time there abouts, my problem is the rooms are large and albeit rectangular they are in odd dimensions, I can fix that, by changing them to multiples of 24". then array the first two 1" wide strips (one on X and one on Y)then if needed for other rooms that are odd sized I can manually draw the odd spaced wall angles "bars". What happened last night when I posted my first message was I used guides 1"-24"-1", and the same with the 48" tees then drew real lines over them, and closed the ends. I had a senior moment and didn't think of using an array technique. So this morning I will try again.