is the bike more or less complete?like it only needs to be put together?you might find someone close by from here who can help?go to your local library (or computer) and find info on the four stroke engine if you dont already know how they work,its the same as a car motor,if your motor will run with out being taken apart half the battle is won,have you got enough hand tools?this is where a mate can help out!,its a modified frame so how good the welding is should be looked at,your right about the safety aspect,you could buy a going bike and use this as a spare engine/parts bike ,and or sell it,or press on,,you sound keen to get riding,,this project looks like itll need a fair bit of sorting once its running,,plus i guess you have an inspection certificate to pass,,dont give it to a shop,itll cost a kings ransom!!id buy a similar running bike,have fun on that as you learn on the project.
