Sorry, I can't place it yet, but it does look like a fairly solid construction, even for a custom job. I'd certainly buy it, just to appeal to the tinkerer/up-grader in me. I personally like the mesh/bucket seat set-up.

After examining the lower picture closely, you should be able to retro-fit disc brakes on the front wheels, leaving the rear as a backup or parking brake. A good bike shop should have the tools and/or know-how to install disc brake (including welding anything to make it possible).

It will be a matter of preference whether you want two independent front brakes, or link them together under one lever. I have both systems on my trikes, and kind of prefer the later on my Anthrotech - hydraulic drum brakes on the front and calliper brake on the rear. I like being able to have all three wheels provide stopping power. Then again, my Nomad has only independent front disc brakes, and being able to brake-steer into a fast tight corner can be fun and useful.

In terms of living with a rear-brake only trike: yes it can be dangerous if you don't take the time to learn the trikes limits - where is the edge when the rear wheel begins to let go of the road, for example, and do you get grip back when you let go of the brake handle right away? It could make a good first trike as long as you look into upgrading it with front brakes in the future.

For just puttering up-n-down the street, say from the corner market to home, and the terrain is flat, then a rear-brake should work just fine as long as it is in good shape.

And yes, the front wheels look like they will need some re-alignment, which could be easily adjustable by the steering tie-rods.

Good Luck, and keep us informed!