Ok, after working on this for a couple weeks I have some perspective to share.
If you want to do this with parts from a local hardware store. Don’t bother.
There are vendors on ebay that will sell you all this hardware in a bundle. Yes, its about twice what you will pay at a hardware store. But, its all the correct sizes and you don’t need to keep driving to get something you forgot. In fact, if you search for “Prusa i3 Rework” or “Prusa i3 Einstein” you will find bolt sets and rod sets. And, considering I bought the wood frame, there is a vendor that bundles all three together.
So, I feel this challenge is achievable. But, I wasn’t really worried I would be able to do it. Did it save any money? Maybe, but not much. Did it save time? No way!
If someone offered to hand me all the parts I needed for an extra $20-30 so I wouldn’t have the hassle of multiple trips to Lowes and Home Depot (Some seriously frustrating because they never restock this stuff)? Heck yeah!
In fact, there are a couple kits from US vendors. One even comes with a real J-Head from hotends.com and the exact same quality motors I am using. Search for “Prusa i3 kit” and read which one uses a real j-head. I’d go with that one and be printing last week for about the same money I have in this thing.
The $400 kit mentioned about is good. But, if I had to do this over, I would get the MakerFarm Prusa i3v. Their V-Channel design adds all the strength and stability that is lacking in the default i3 design. It is only about $100 more than a DIY kit done to the original specs, but has many advantages. The MakerFarm design will negate the need for most upgrades you need to do to a regular i3. Someone build a time machine and tell me this!!!