In regards to the A-26A/B-26K screenshots I posted, those are from way back in 2007, when that project was put together. For the cockpit, I basically copied over the seat, control yoke, and rudder pedals from the one side, over to the other (and evidently re-mapped/textured the control yokes and columns). I re-made the instrument panel into a two-place panel, and working with "Real Old Salt" (who made the gauges, the instrument panel, and some of the textures for the original release), some new gauges were developed for it. I also added some basic seat cushions to the seat frames.
My plan for re-visiting the A-26A/B-26K, is just to recreate the model that was, now for FSX, and re-package it with the same textures/panel/gauges as originally (with new prop, glass, and bump map textures). It's not very hard to just look at the original, existing model in the sim, and copy it (especially as the changes/additions that I did make to Milton's work to make the A-26A/B-26K weren't very complicated, lol - it was one of my very first introductions to aircraft model development).
BTW, "Real Old Salt" also made a Lockeed Air Service Super-26 using Milton's source files (a bit similar to those conversions above), back in 2007, for FS2004, which can be found here:
http://www.sim-outhouse.com/sohforums/page.php?lloc=downloads&loc=downloads&page=info&FileID=9538
Also, here is an alternative set of gauges for the original A-26 models that doesn't have Real Old Salt's avatar in the gauge reflections, that Real Old Salt provided, which can be installed/used if desired:
http://www.sim-outhouse.com/sohforums/page.php?lloc=downloads&loc=downloads&page=info&FileID=8747