my advice to anyone doing this is to first do it on very very simple scale. e.g. you opted for a machine whose parts are scarce, that is a wrong move - get a common machine like a cd70 and then set about getting it to 100% factory specification.
During that exercise you will pick up nuggets of experience and information e.g. how to correctly wire up systems or how to handle assembly techniques. This arms you with a wealth of information (you can even take notes on it)
e.g. sealing up a motorcycle crankcase is usually done with philips screws in Pakistan, IMO they are useless - get proper allen head screws that you can torque down properly, make some thread cleaners with old screws so your engine casings get evenly tightened. Similarly learn on the principles of sealing/locking threads and engine sealants (there are differnt for different jobs in the market)
during all this you will also learn about different forms of lubricants and even speciality ones (e.g. engine assembly lube).
you should also read the service manual to the dot and then question the logic of why its specified in a certain way and why not the "ustaad" or "lathe machine walay ustaad" way.
e.g. you wrote that you had stuff chrome plated for a measly Rs 6000/- I can guarantee you thats just a flash dip and that coating will rust away or peel off in a few months only. The proper way to chrome is quite expensive but is definitely worth it. (such experience is gathered by doing such work with your own two hands)