This is why building bicycles can be cooler than building a pc. You will have to do the research, determine what is doable and or affordable. All of this is subject to your will, patience or lack there of. Some things may be unobtainium or too cost prohibitive. Some things will have to be a judgment call based on all of the above. At this point I think you have the best thing by making the frame right. Everything else will benefit from this solid foundation. Have fun, try not to stress over exactly correct as you can get pretty close most of the time and correct is very subjective in many cases. Patience will always yield results, if you cast a wide net and be prepared to make some substitutions when necessary as some things will come along that will make great choices even if not correct. Keep asking questions and take all with a grain of salt including mine and you will end up with something very special. You are already well on your way, most excellent.