As somebody who wants Arrow keys in a 60% layout, I present the Alt Pure Pro Layout.
http://www.keyboard-layout-editor.com/#/layouts/d916484ba0ec37d4befbde2d1d8fefddFirst, the problems with the stock pure pro are plenty. Fn Pn programming is flat out weird, really odd placing of keys, and the dreaded bottom row.
This design solves for many of the problems but there are still one or two that cannot be avoided.
The board will be fully programmable so as long as key positioning is good, there shouldn't be anything to complain about.
It should fit in a standard 60% case now, and I will go for a PCB mounted design.
For keycaps, I am thinking of going with DSA blanks, so the 2x shift and 1x shift won't have to be custom made.
OLD DESIGN--Scrapped because of screw positioning
More
As a arrow key and navigation cluster junkie, I wanted a 60% with those keys.
Thus I present:
The Alt 60 Project.
60% footprint, but more keys.
Benefits:
Arrow keys and more on the right side
60% footprint so you can use existing 60% cases (tex, FMJ, Hammer, etc)
100% programbility(to be added later on)
Layout will most likely be:

It will be PCB mounted style at first, as getting a plate cut is harder than making a PCB. Cases are the easiest to source for this project. If plates are really popular, I will try to get some made later.
To do list:
Design PCB
Original OP:
I was thinking of an alternative 60% layout:

http://www.keyboard-layout-editor.com/#/layouts/193b06a2ef7b17857b2a07e4ee3c11fc
It fits in a regular 60% case.
Each row in a traditional 60% layout is cut off by 1 unit in total by removing .5 from each end. The exceptions are the top row, R shift, and bottom row, where 1x is removed from Backspace and 1.5 is removed from R shift, and the bottom row is different from spacebar to the right.
In addition, a navigation cluster is added. Arrow keys and Home/Up/Down/End. There is a Fn and Pn button on the bottom row. This can be changed whether or not you use certain keys more or less.
Regular keys for modifier keys can't be used anymore, but the alphas (minus |\) are the same, as with 6.25x spacebar and 1.25x bottom row mods. The sizes for keys are still pretty standard, and any flat profile blank keys can be used without problems.
The bonuses of this layout is arrow keys and navigation keys in a 60% layout that still fits in a regular 60% case.
Thoughts?
In terms of keycaps for people who want legends, without getting a specific pack for this layout, an TKL+ISO kit+Tsang kit will take care of everything except for the caps, enter, \|, and backspace keys.
If somebody could make a PCB for this with compatibility for various bottom row setups, that would be awesome.