Hi,
I would think a twin oscillating engine would provide more than enough power for this, but you need to remember, the engine is only as powerful as the steaming capacity of the boiler.
Also, unless you are familiar with steam, there are some basic safety issues to be aware of. I have gone through these in the all steamed up section of the forum, probably most of your questions will find an answer there, if not, ask away.
If you look under my builds, at the steam drifter build, you will see my engine and boiler, it will give you an indication of size.
Ian