Laps are cool, when I retired from my day job I spent the first 4 years making custom lap steels and marketing construction information on my website. I gave up laps after doing about 100 customs and moved on to open back banjos. Some folks specified Lollars or other specific pickups but most had my own 6, 7, or 8 string split single coil humbuckers.
For those that may want to make their own you can still access the information and a few of the construction plans from the internet archive of my old website:
http://web.archive.org/web/201603130...com/page5.html