There is even a video series on you tube about assembly of an mch-6, not intended as a teaching tool as I remember as it was quick, but if you watched it frame by frame you could learn a bit.
I wholeheartedly agree with Ray, if you can change a spark plug, you can rebuild a compressor.
They mechanically simple air pumps. Getting clean air out of it, well that requires some learning, and it is time well spent, Ray has parts for reasonable and fast and is even helpful when you have questions, about that extra part or two.
If it meets your demands, buy the mch-6. Just dont run it continuously.
I have two mch-13, and have taken one apart and put it back together and it still ran !