Multi-part DCT - how?

System

Hi Templaters -
I'm on TeamSite 6.1 on Solaris and want to build a multi-part DCT. I'm posting for both a reality check (is it possible?) and, if it is doable, for some pointers.

Here's the deal:
I've got a standard header and left navigation area on a page that I'd like common on all generated pages. I'd like to break up the rest of the space into (let's keep it simple), 2 equal columns.
I'd like to set those 2 columns up as separate DCT types.

So, that could be 2 DCTs and a PT that 'includes' them. Seems pretty simple, but I can't yet imagine the user experience. It'd be best if they said they'd like to create a new page and then were presented with DCTs for both columns and, when done, generated the resultant page.

Ideas on how to go about this? I can imagine it from the perspective of starting from an already generated page, but not from scratch.

I'll be glad to clarify any further!

Thanks,
Wally Box
Nike, Inc.