I seem to recall that Lima's early attempts at a Mk1 BG full brake incorrectly came out at a scale 64' instead of 57'.
You could do worse than acquiring an old Kitmaster Mk1 BSK or CK kit and using that to break down as per @Mayner 's suggestion
I don't think he fully understands it either but, equally, he doesn't really care since it won't affect him personally - his finances (dubious at the best of times) are mostly insulated unlike most of his supporting clientèle.