If you search the old posts here (with google) there have been some good long banquette threads--this one has some detailed specs from Igloochic as well as KKelly's beloved morgue drawers:

Here is a link that might be useful: http://ths.gardenweb.com/forums/load/kitchbath/msg0517485121309.html

My banquette bench is sort of U-shaped (set in a bay window) and is not framed out with 2 x 4's. It was professsionally built by my cabinet maker using 3/4'' plywood.

Here is one that was built with 2x4's. I believe it is from GW but I don't know to whom it belongs.

I just posted a bunch of pics of our banquette in progress. It's nearly done. Perhaps some of the progress pics will explain a step or 2.

I initially drew what I wanted out on graph paper with the sizes etc... and then when we actually started doing it, it was a constant re-adjustment for real life situation.

definitely angle the back. Much more comfortable.

we framed it out in 2x4's. VERY STURDY!!! (with 4 young kids, you've got to build it tough!)

lawjedi. Can you please give me the name of the thread with your banquette pics or post the link here so I can find it? Thanks.

I found some great information on building a banquette on finehomebuilding.com. Ours was built with a 2x4 base.
This is before final paint, but otherwise complete.

This post was edited by kfhl on Wed, Feb 13, 13 at 10:51

kfhl:
Like the look of yours. That's about what I'm going for. I found the finehomebuilding plans this morning, but I don't have a membership and don't want to purchase just yet.

@island
Here you go, I was just looking at the post earlier.
Hope I linked correctly.

Here is a link that might be useful: Almost done & sharing banquette pics