If you're seeing soft sports in the market find the perfect property and negotiate hard on price.

No soft check? 

We usually like to see the land purchased and the permits in hand before we fund the construction phase, but the amount spent on the land and other soft costs go towards the down payment.

And the soft costs can easily pass 100K before your project even starts. 

I think you will find it is not possible to act as your own GC for such a build in your town/county on a new construction project that you do not intend on living in.I also question your costs, as you have indicated that you plan to build a 5000ft2 house for $750k, including land, soft and hard costs. 

As for an offer, start with your ARV and subtract out your renovation costs, financing costs, a reserve amount for contingencies, any profit margin if you plan on flipping it, closing costs for both the buy and sell sides, and soft costs for the permitting, etc.

You are hurting other investors and values in your area being soft on them.

So these platforms will be looking to teach people how to source deals,  use their experience and soft ware etc.   

Construction Loan with at 80% LTC with $ 800,000 held back for construction and misc. soft costs.How did you add value to the deal?

You may have to go creative rather than conventional, but depending on where it is and what you are doing, you may be looking at anywhere between 100K-300K in soft costs (permitting, design, architecture, utility hook ups, etc.) and a construction budget of probably 1 Mil to whatever, once again depending on what you are doing and where.