Welcome Nick...There is a wealth of information here... Since you have mechanical ability you shouldn't have a problem. Little over a year ago was my first build...getting ready for my 6th. Most important thing about choosing a bike is that the engine needs to be mounted in a 75 degree "V". Weather you need to make a modified front mount depends. There are a number of mods that I do even before the engine is mounted. Some are a MUST and some because I want to, all inexpensive.
That bike frame looks like it will be quite worthy of a engine.
Have a look.....
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