Are you planning on submitting an LOI?

My city requires you to submit gross receipts and fee is calculated at $0.16 per $100, and city said gross receipts is the sales price.

Prepare as if submitting to the IRS.

I've filed insurance claims for roof damage by submitting the video taken.

I would also ask what the process is to submit your draws.  

I've submitted additional potential comps to the lender but there aren't that many duplexes recently sold in the neighborhood of the property.

And I am already submitting offers for my 2nd. 

This means you have all the funds to close, e.g. expected to qualify for the loan and have sufficient cash to close.As a real estate agent in NJ, I couldn't submit the offer from what you just represented. 

My concern is if I have a contractor/inspector look at things prior to me submitting an offer, it could be a huge waste of their time (unless this is common?).

@Gustavo BrisenoUsually when purchasing a property with seller financing, you will submit a LOI (letter of intent) to the owner that lays out the major terms of the purchase, which will include your proposed seller financing.