Looks like you plan on drawers of slightly less than 4' (~45in or 1150mm). It has been my experience that long horizontal runs of 2 x 4s benefit from vertical supports.
Yes indeed, I am in total agreement (but was too tired at 1:30am to add in that detail at this stage). Even though the bed cavity will act as a stressed member to transfer some of the support to the drawer carcasses (and to some further support underneath them, I will be putting in some additional 2x4 vertical supports (maybe one between the drawer carcasses. In addition to this, the member that is against the wall will be fixed into the masonry wall.
Which actually leads to the next question (which probably needs another picture, and more Sketchup work
) What is standard practice in relation to dealing with the skirting board? I would like the top member of the frame to be secured to the wall, but the existing skirting board will then not allow the bottom member of the frame to be hard up against the wall. Do I:
1) remove the existing skirting?
2) somehow offset the lower member to allow for the skirting? (ie the top rectangle of the framing is different size to the base rectangle, and the rearmost verticle supports would not be hard up against the wall).
3) do something else?
Thanks again for your comments. All appreciated.