Trimming MH/SB/Charlie Seed Trays

Hi Everyone, I am on my way to building up my MH/SB/Charlie back pack but am stuck with how much to take off the seed trays?? I tried to have a look at Mike's back pack build for pics but the link with his site is down If someone could please confirm whether to trim all the way down to the red line in my picture or leave it at the blue line, that would be great. Maybe even a close up picture of your MH/SB/Charlie seed trays completed would be a great help aswell. Thanks Dan

I've figured out how to trim the seed trays and get them to stay in position! The trays are shipped with a 1/4" lip all the way around the edge. If you try to butt the trays together with this lip, they'll never line up, nor will they stay in position. If you cut down the lip on both trays so they are completely flat, then the trays will slide apart, as evidenced by the "move along" backpack: So (although technically not exactly screen accurate), trim the lip on one tray: Now fit the