My wife is an artist /interior decorator too and makes beautiful spaces on a budget, so would kill it with MTR, I think. 

My thought process going in was that the roof would be 1/4 of the total rehab budget.

The flip or brrrr route could help you grow your capital faster, especially with your $75K budget.

Once you have experience and learn to budget for occasional big ticket cap ex items that every house has whether it’s 100k or 1M, it becomes really hard to make any profit.

The right wholesaler that knows how to properly calculate a SOW (scope of work) to gain the rehab budget, generate an ARV from local comps and not want to get rich on every deal is NOT easy to find....but, they do exist.

Is there a lender who will lender who will give the construction budget right at the closing (when I purchase the property)?

If there's anything I've learned over my entire portfolio, is that there are always more projects around the corner, they take longer than you think, and they're more expensive than budgeted.

Depending on the rehab budget, you would be looking at up to 90% of the purchase price, 100% of the rehab, capped at 75% ARV. 

Challenges included navigating owner hesitations, coordinating renovations within budget, and managing high expectations for occupancy and pricing in a competitive rental market.

Your budget can not dictate the safety of the project and your relationship with the town and permitting.