A stretch would be 3000 (600 avg/unit).  

Should I save more money 20k-40k and stretch out my timeline?

Unfortunately, I see a lot of people stretching things and passing off D class properties and C class and even B class.

Installation will involve a stretch of gas pipe, limited water plumbing to tap into the existing pipes, and some electric work.  

I am thinking of doing that in order to rent the front out.Comfortably I have $50k to throw into a deal, and if I stretched it, could put $100k into a deal.

With owner financing they aren't getting their money in full as they are seeking so I feel like any option might be a stretch but give it your best shot.

Keep saving and building credit, but right now another property would be a risky stretch.

I realize this may not be available in the Austin market, but reaching out to the community just incase it's worth looking into while I'm there.Price wise I'm pretty open so long as the numbers look good (although as a newbie I don't want to stretch myself to far as I'm learning).

Not a developer by any stretch but I am thinking that excel is not what you want to use for this type of application.

This differs market-to-market and I would defer to your local broker for accurate information but most people would tell you where in "the 7th inning stretch" at best which means there is a good chance we are in a down market in 6 years.