Basstrap layout help

Hey Everyone So my roxul rockboard came in yesterday http://www.atsacoustics.com/item--Roxul ... -RB60.html And my burlap should be in today (chineese red) http://www.hancockfabrics.com/product--9186.shtml so now all I need to do is go to lowes or home depot and get wood and glue to make my bass traps, the only thing is i'm not sure which is the best way to put them in my booth, which will make a difference on how much wood I buy. those 2 pics are basically what I'm thinking as far as layouts, i'm just not sure which is more effective. On the first one the one in the corner that is broken up into 2x2 traps is because I put the exhaust vent by that corner not thinking about the bass traps. On the 2nd one I know by the door I'd have to change the angles in real life but it was just quicker to do it like that. and the reason. There is one other way I thought about doing it, and that was to leave the one in the back corner like that, then have 2 2x4 traps angled between the wall and ceiling on the long walls. Thanks for any advice! I'm really looking forward to set up my drums and play them for a few mins without the traps then to install the traps and hear the difference. -matt