Thanks guys, very kind comments cheers..
I bought some 12mm x 12mm x 55mm pre-cut corian lengths from ebay ready to drill and trim. I sanded the rough cut sides and made sure the pre finished smooth edges were the ones I glued together first. Being small pieces I glued them against my small set square to keep them straight. Drilled through the centre as usual and trimmed a little off the corners on the band saw.
Simple as that really.
I'll be trying a few more tomorrow but I'll cut my own corian from my stock and see what weird and wonderful combinations I can glue together.