Well i have just been out in the workshop to finish off the 'Z' of my small desktop machine and screwed it all up because i was interrupted. I cast and machined all the plate i needed, cut it all drilled and milled only to realise all the planes are wrong because i needed to stop and re-adjust my mill head. A point in question relevant here. You can spend a lot of time and effort to make as much as you can but not always effective. I will give up and now buy the appropriate parts. The cost of the time (which is the most precious cost) is what hurts most. The profile will cost more in the end but will make the job easier and quicker to get done. Better to wait a few weeks more and get it right than be in a hurry and see the cost mount up. Just think the time you have in the middle can be used else where?