Frank, send me your address via a PM and I'll send you a nice bundle. You'd probably shed a small tear if you knew how much of this wood goes in our wood burner!
I think the largest size is 90mm square. Certainly I have three 800mm lengths of that under my desk as supports. It's from a mate that works at a bespoke kitchen makers, (they did Cheryl Cole's mums not long back for 60k+!!) only use it myself to make nice bases with, comes up a treat under a few coats of shellac
Sticking bits of plastic together is one thing... This is something else entirely and I'd be dreaming if I thought I could do it! Nice to see though. I look forward to seeing your Flying Scotsman.
Dan