The HK30 was a 3 HP engine and not a 2.5, so either someone has changed the tank or the air cowl has been substituted at some point.
Hello from me too!
BB, I have found other examples labelled as 2.5 but fitted with the HK30.
These include 45 62273 and 45 65020 (from my records). So, I feel it is
all original kit. Perhaps it was governed to a lower rpm?
It should be a nice project and one to follow. There would be plenty
of life in this one, and should serve you well.
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Jack