aagh, I edited this on the instructables mobile app and its deleted the intro page, I'll sort it out when I get a chance later on..
photos and sketchup model here for now
Step 1: Get Wood
Get your pieces of wood cut ready, I'm using 4mm plywood which will give a final thickness of 16mm for the heart when assembled, I figure that's a nice size not too big but not so small it gets fiddly.
Cut 4 pieces, I then used a block plane to get them the same width, but this really isn't necessary as your going to be sanding them to size later anyway, so don't bother.