Just finished a larger scale of Gerry's Beam Engine. 1.5 bore by 3" stroke. 12" scale laying in front of engine. I used the prints , but scaled it up 3 times. Made a lot of changes to prints , small improvement that helped I believe making it more solid and easier to line up. Build time was less than 90 days. but I have alittle more toys to play with that helps that along. Cad files were a lot more help than prints, lots of dims missing on prints. But over all design is there.