Wife and kids are out of town tonight so I've got all night to dedicate to the project. I don't think this has happened.... umm... ever.
With this huge block of time I've decided to cut into the sides and route the dados that will hold everything together. This is the one part of the project where there is no "do over." I was only able to get the cherry with my dad's help so if I

these cuts up I don't think the project will recover. So I'm literally trembling at the thought. What makes the whole thing so terrifying is (1) having to cut the dados at an angle and (2) ensuring they will line up across the cabinet with each other once the sides are angled outwards. [/drama]
The steps for the night are to
Draw out dado (and a couple of mortise) locations on MDF.
Route completely through the MDF following lines
Trim the MDF into the cab shape using a side panel as a template
Use the MDF as a stencil to layout all the lines on each side to match perfectly.
Build a jig to attach to the base of my router which will angle it propery to cut the dados.
Clamp guides to the sides
Gulp
Route the side panels.
So if all goes well tonight I'll be posting pics triumphantly for tomorrow morning. If something goes wrong I'll be back here ranting and howling in misery.
This is the dado plan
Blue indicates dados green indicates mortises.
