Hi Marvin welcome
I see Pete has been busy filling you in

another style of Rose Engne is one we based ours on here downunder by
Geoff OLaughlin or this one by
John Lee
Yes all to true the expense can run away no matter what you take on many of our OTGA members make a basic and it becomes a WiP from there always tweaking. Its amazing where parts bit n pieces can come from free.
You spot an idea and its on again fitting it up changing it re-working it.