Great post and topic, one which will only gain momentum and attention given demographics. It actually touches on a greater issue and that is, how big is big enough when it comes to the size of one’s home.

With respect to your topic at hand though, one great on-line tool that I’d recommend is a room planner like the one found here:

Room Planner

I recently used it to plan our nurseries and it worked like a charm when picking out furniture. I’d suggest users consider space allowances for things like drawer pull-out or swing of cabinet doors etc.

Hope you and your readers find it useful.

Cheers