Help choosing new engine to build

[Nikhil Bhale]

Hi,

I have completed two of the PM Research engines #1 and #5 and a bar stock Stirling engine. I now feel fairly confident to broaden my horizons.
I am interested in building a Rider Ericsson pumping engine. I have my eyes on this kit
https://www.myersengines.com/engines/pumping_engine_1.htm
Has anyone built any of the above engines? How is the quality of the kits?
I have a Sieg C4 lathe and Sieg X2.7 mill. Which kit will be suitable for me? 1" or 2".

Any replies will be appreciated.

Regards
Nikhil