That "kitten" looks to be a real Treat, thank you for sharing Jim!
Is the kitten a production engine? Or something built by a talented machinist?...I did a quick Google search and did not get any hits for any engines that look like this! -Ben
Ben the plans for the 'Kitten' is in Tubal Cain's steam engine plans book.
The 'Kitten' and the 'Polly' I think are the most popular made off his plans.