You do realize the "mini D2" projector that you're using was not available when SBG created the headlight kit right? What you've created isn't really what I would consider a product. But yeah SBG is definitely price gouging....
The projectors SBG uses requires a great deal of customization to the headlight housing (time) time isn't free buddy. Actually those mini projectors seem pretty easy to fit into the sonar lenses, I'll give it a try and post a DIY if it's easy enough
The Mini projectors definitely put out nicer light then many of the other projectors out there.