I like your plan, but if you are looking for some constructive criticism:
1. I'd shoot for more than $100/door. At that rate you would need 10 4-plexes to reach your first goal. You will not be able to obtain that many mortgages either.
2. Not sure of your level of experience, but in my opinion you should be intently involved with your first investment property. If I did buy property out of town I would be sure to have a team (agent, prop management, lawyer, contractor, and handyman) in place before I made an offer on anything. I would not plan on doing any kind of renovation on an out of town property.
3. Evaluate your goals often. When i bought my first MF in '08 my goals were very different than they are today.
I initially planned to to buy a MF every 2 years which I did for a few years. Now I am more untreated in discounted SF and master leasing MF
4. Exit strategy to move on to your second goal. SF are easier to sell with a larger pool of buyers.
5. Financing is often a limiting factor. You gota find the money to make any money.
Good luck on working your plan!