[peakay]

Had another model with the same bed.  It was big enough but the awkward shape was problematic.  I built a removable platform to fill in the entire space where the extension is in your picture.  I then cut a piece of memory foam to fit.  That made the bed huge, no more problems!

Thank you sir.  Can you share details on how that was built?  By platform do you mean something that extends all the way to the floor??  

I was thinking the same thing if that "drawer" could be made bigger you could just cut a piece of foam to fit.  The standard cushion doesn't lok too comfy anyway.

Photos would be amazing if you have them.