Air intake snorkel

Hello does anybody here know how to make a air intake snorkel for a m151. Can you just make it from scratch and if so how would you go about doing it? Any suggestions will be well appreciated thanks in advanced.

Have to see one to get a better idea but if it's not too complicated, I'd start with a visit to my local exhaust systems supply house where all the muffler shops buy their elbows, pipe and the like. Might also scout around some of the surplus sellers like Saturn or Franks. Some of them have a soft spot for the 151s and stock a lot of stuff for them.

Thanks alot I will check them out