Hi Gary,
You need to obtain the relevant copies of LLAS if it was described in LLAS (Don Young's quarterly magazine). I will need to check if it was so described as a construction series in LLAS.
It is a fantastic loco to drive! I drove a rather poorly made example that nevertheless went like a rocket, steamed superbly, and rode like a bogie coach. It is an excellent design IMHO.
Cheers,
Julian