I bit the bullet and decided 5mm for the shelf pin holes, I've made this jig, not yet drillied out when I took the pic. I've used it and drilled the pin holes in the right hand side of the cabinet.
So on to the walnut edging, can you believe I need in excess of 180 ft run 13mm x 13mm
this took much longer than I thought, first job was to cut slices off the 2 1/2" plank I've got, then plane and thickness them to a little over the thickness of the mdf. Then I ripped them down, each time I passed the remaining piece over the planer before ripping the next piece so I ended up with three face already planed. Then lastly a pass through the thicknesser on two faces to match the mdf thickness.
Here's a pic of all the pieces of walnut.
I thought all the housing joints or dadoes were a bit tight so I've eased them a little as can be seen in this pic.
I've started gluing on the walnut to the two side panels using just pva and #10 biscuits.
Hopefully tomorrow I will be able to dry fit all the main components and maybe glue them up.