Owner-builder advice please!

[Ben Rodriguez]

I have an opportunity to purchase five adjacent lots at a pretty decent price ($125k total), but I have no builder or rehab experience.  Is taking on multiple lots too much for an inexperienced noob?  How can I take on this project without getting in over my head?  My idea is to make the purchase with a construction loan and build one home each year as an owner builder.  I'd either sell the first one after a year and use the profits to build the next, or I'd rent it out and do a cash out refi to build the next.  I'd also like to avoid the capital gains tax on at least a few of the houses by hoping around from one to the other to satisfy the 2/5 year requirement.  For example: 

2020: build and live in house #1

2021: build and move into house #2, rent out house #1

2022: build and move into house #3, rent #2

2023: build and move into house #4, rent #3

2024: rent #4, build and rent out #5, move back into #1

2025: Sell #1, move into #2

2026: Sell #2, move into #3

2027: Sell #3, move into #4

2028: Sell #4, move into and pay off #5 with tax free earnings from previous house sales. Or keep as a rental and buy something else. 

Having spoken with a couple of real estate agents and a GC friend, if current conditions stabilize, I believe I can conservatively take home approximately $45k per property if I was to sell rather than rent them out.  The reason I would rent them is I would have a small passive income from each for at least a few years.  And, as new builds, maintenance should be minimal and capital expenditures practically non-existent (though I'd still save for them). 

I should also mention that I have a secure, well paying job and I'm not looking to get rich quick.  I'm also relatively minimalist so moving so much is not an issue for me. 

I currently own 4 rentals, have a 750 credit score, and am sitting on approximately $45k in cash. I also have access to $55k in an unused HELOC.

Please let me know your thoughts and whether this is even a good idea, or if I'm out of my mind.  Thanks in advance!