Hi Fred,
Since no one else answered, I will.
The first two are good because the tuners stick up and are easy to tune.
The steel at the top with a cut out peghead slots needs just one board to build.
The middle steel needs two boards so will be thicker and more work to make.
The last one is still tunable, but you have to reach over.
The reason I did that was to keep it more like the National New Yorker that I was kind of using as a model.
As much as I like my design, the other two would be more convenient to tune.
Hope that answers your question?
Best wishes,
Andy
Inlaid Star Guitar 2006 by Mark Giles. SD-10 4+5 in E9th;
http://luthiersupply.com/instrument-gallery.html
2017 Mullen SD-10, G2 5&5 Polished Aluminum covering. Custom Build for me. Great Steel.
Clinesmith Joaquin Murphy style Aluminum 8 String Lap Steel Short A6th.
Magnatone Jeweltone Series Lap Steel, Circa 1950? 6 String with F#minor7th Tuning.
1956 Dewey Kendrick D-8 4&3, Restoration Project.
1973 Sho~Bud Green SD-10 4&5 PSG, Restoration Project.