Looks good and you have bright color / contrast for visibility. Interesting to read you have one of the few glow engines you can place anywhere relative to the fuel tank and not have a fuel delivery issue. First time I've seen a YS on a trainer though. I had a FZ63, and a 2 stroke 45 and 60 years ago on my Super Sportsters. Good running engines. These days it's harder for me in my area to find compatible fuel to run them.
What are you using for an after run oil on your YS engine? It's got its quirks there too.
YS engine after run oil
Other engines like OS Engines with internal/external pumps also give you flexibility. Perry seems to be still kicking too.
Perry Pumps - Pumps
So, when are you going to get her back in the air?