Just pushing a method I have practiced and throwing it out there to see what your feed back is.
This is what I do and why in regard to most panel doors I manufacture.
To me the doors on a side board, or any cabinet with doors around 600mm x 450mm do not need to be heavy. I try to keep the weight down in the styles and in the panels. My panels sit just under flush with the styles and are 14mm thick. The styles are normally 20mm thick. That way I can sand the panel before assembling the door and sand the frame easily once assembled with out messing up the panel.
What are your thoughts?
-- Andy Halewoodworker. You can't finish if you don't finish. So finish it, because finish is everything.