Joe-bike up in Portland has the kind of store I’m dreaming of. He offers a variety of unusual and useful bikes for many different people. I might focus just on the kid-carriers, and he offers a couple of those.
Joe’s Unique offering is the Joe bike. 
He takes a short-wheelbase box bike, completely updates the hardware, retrofits a custom rack mounting system to the front, then powdercoats the whole thing.
One of the front-mount accessories is the “tandem” seat.
What a tremendous way to take passengers around. Up in front, riding with you but not earning their keep. It looks like it has a handle and side rails for the tandem, plus a spot for small stuff.
The three-configuration Joe Bike is $2699, including front disc brake with Alfine hub (not shown in the photos), the double-decker racks shown in the photos, rear deck, and the box, along with features such as a Shimano low-resistance dynamo with a superbright front lamp, rear light that also incorporates an automatic brake light, full fenders, full four-point kickstand (not shown in the photos), rear-wheel lock, mirror, and bell. You can also choose your own frame and rack colors at no extra cost.
Nice work Joe, keep it up.
