If you're 10' long, go a little deeper then! I wouldn't go TOO much deeper, but it's up to you.
All I know about TD camping is what I've learned here, and I haven't BEEN camping yet. But the consensus seems to be that your galley is going to be more of centerpoint for everything rather than the ONLY point. Know what I mean? For real comfortable food prep, you're going to want to use slide out and other side tables.
I'm going for a lot of open storage space in mine--not a lot of drawers and such. So for permanent installation in the galley, my 3 "must-haves" are a Coleman Hot Water On Demand unit, a sink, and this combination range/oven:
http://www.cabelas.com/cabelas/en/templ ... sults1.jsp
And think about it--how much space are these 3 little things going to take up? The combo unit is going on the floor, on a slideout drawer. (See MexicanTear galley.)
And I hear you about covering up mistakes with trim. My problem is covering up my screwed up trim!