If I were you I'd find a niche item that could easily be 3D printed and then custom make it for residential DIYers, construction companies, and handymen.

The rest are totally custom and control literally anything.

My company's Excel-based REIA program uses well over 10,000 lines of VBA code that is hidden from the user, but which provides functionality like custom menus and toolbars, data-input wizards, report customization, etc.

We know that, and we constantly seek out feedback from our customers.  

Hi BP community, What is the industry norm (average) for referring a customer to a business broker who is looking to buy a business?

Throwing that word around in conversation and in emails with your deals or with "customers" (not called "clients"- also implies a legal relationship) can come back to bite you.

Given the area of Del Cerro, we used high end finishes throughout and every detail was carefully picked out from the door knobs to the iPad control station to Bose surround sound throughout the house to LED mirrors to the Versailles travertine floors to the wall hung toilets to the custom cabinets w/ granite countertops, etc...Nothing was left untouched!

They might do it free for you if you're a good customer, they might charge 1%, they might demand a full 6%.  

if so that is SKY high.unless he is carrying the job for you..but if your paying all subs and providing all the capital and its not a one off custom build you will find that 15% of cost is just about all your profit or equity. 

I sent a repair estimate to them highlighting the most expensive items.