I'm looking for recommendations for someone who has experience structuring loans to minimize the taxes for me as well as either a service or software to maintain the loan, writing the note properly and how to receive payments etc.

You probably aren't looking for a conventional loan, since you mention owner-occupied.

I heard it's a good start to look at how much the cost of materials are and call local workers on how much they charge for labor.

Purchased a home in February with the VA loan.

Interest-only loans, 1031's, cash.

It's going to depend on what type of loan you're planning on getting, and fees vary from lender to lender...same with title fees.

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The problem you are likely running into is the Log Cabin part of it - at the end of the day, DSCR Loans are really still intended for properties that are generally usable for full-time owner-occupancy year-round living if needed - so true log cabins are pretty much outside of anyone's box.However, its definitely a grey area on what differentiates a "Log Cabin" from a "Cabin-Style" home. 

I used the VA loan to buy this house.

cash, conventional loan