Thanks for the comments.
Mick: The GER took the front rods off tanks working lines with sharpish curves in the belief that it reduced flange wear, such as the Fenchurch Street to Blackwall line and Tiptree to Kelvedon. The LNER and later BR used surviving J65s on harbours and docks which were more suited to four-coupled locos. The GER didn't confine the practice to tanks though, and took the rods off a 2-4-0 T19 express (basically an LNER E4 with 7' drivers instead of 5' 8") and ran it as a 2-2-2 single. It was a success and the D27 2-2-2 class went into production.
Many parts were cut using the old-fashioned piercing saw method, though I had some of the rectangular parts like buffer beams chopped out on a guillotine. Nice little locos, and I've got one in hand to be finished in GE blue for my own collection.