Sure Tim.
60+ years old floor. Still going strong but I thought it was as good a time as any to replace
before The easiest way to remove was to take a saw. and marking a 90degree half way line I hacked straight through the floor so that I could still piece back together to make a template for the new timber
floor removed timber bought. 12mm Birch ply for the waterproof layer with 8mm Iroko decking layed on top. The Birch has many more layers of ply than original and tighter grain. As long as you wood filler the edges to water tight them and then varnish the undersides there will be no water ingress.
timber selection Tools for the job varnish drying Ply layed in by dropping the wooden body mounts. This lowers the floor by just enough to squeeze in the ply.
Ply in position 
