Alright! this sloper is finished. Now on to cutting the real fabric.
The last thing to be changed was the issue of the straps falling down, this seemed to be a problem with everyone's jumper. I simply raised the back piece by 4 inches...well 3.5" actually.
Seems to work much better, I have zero strappy issue with this muslin --and that's with no lining support and baste stitching. :) gosh I'm such a damn genius!
...try not to mind my "twin" or the horrid office mess in da background.