You have a very nice looking engine now

great to see you’re getting hooked

Did you fire this on Esbit? I would highly recommend looking into a gas burner. Unfortunately that will cost the same as the engine itself, But you can use it in your future engines

As for the next engine, keep an eye out for an older wood-based Jensen 25 with a heavy flywheel. They can be found for under $150 and being your in MN, they are great for indoor running all winter long.
Like Randy, I think I’m up somewhere around 60-80 Jensens too now... It can become very addicting!