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When in need of that many parts, yes, it’s best to be looking for a parts motor. As for the ignition coil, you will learn the that will be a challenge. The coil for that motor is not readily available for reasonable cost. Your motor has a Eisserman magneto for an opposed twin engine. The coil has two secondary ( high voltage) outlet terminals necessary to fire both sparkplugs. There are coils available for that magneto, it is the same coil that is used on the Maytag model 72 twin engine, they are expensive ( search e-bay). A less expensive substitute coil has been identified ( John Deere pony motor coil) but this requires modification of the iron armature laminations. If you do some searching here and on the web there are discussions on this issue. Your Lauson twin is a nice example of this motor, especially cosmetically and complete with the often missing lower cowls., that said, getting it back to running condition will be a challenge because of the magneto situation. Good luck , and please keep us posted on progress and questions.
Joe B
PS, keep an eye on the “upcoming events’ page here. Look for local swap meets where you may find help and parts. If you are “snow birds” , lots of club activity in Florida over the winter.