Okay, I pulled out all six roller-glide drawers and looked at the base cabinet interior.
PC builds the galley base cabinet with a smart production approach utilizing modules. The center three drawers is one module, and the right side 3 drawers is another module. The right drawers are 1 to 2 inches" deeper to the back wall. The top two drawers are deepest vertically to help items clear the recessed stove top. But the obstruction is maybe 1.5", not that much. I compared my PC to my house kitchen drawers. I am making the new single PC top drawer one inch vertically deeper than at home which means only 1/2" less than "home-normal" where the stove hangs down. For my single extra wide top drawer, I will put in dividers to easily identify taller versus lower clearence areas.
I hope to reconstruct the cabinet interior without the use of a back wall as is required with the current modular design. This will allow me to have deeper drawers. I won't know my limits until after I disassemble the two drawer modules. I anticipate differnet drawer depths for best utilization of the cabinet interior volume.
Working with Carol Simms, moments ago I ordered 3 custom size drawer fronts, and two rails. Once I have them in hand, I will start this project. Until then, it's back to the backup monitor and Scanguage-II. I will take step-by-step pics for those interested, with costs too. The hard part for me will be making three large strong drawers that are road worthy with significant weight inside them.
So I guess my Bed Bath & Beyond drawer mod will never see any use. Anyone interested in it assembled to half rails with spacer/bushings attached, send me a PM and we can work out a price and shipping. All you'd need to do then is to slide out your butcher block with rails, and slide in this one with rails.