The Prop48LSD daughterboard is basically a Ren48LSD that is driven via the PropController vs the combination of six PICs. It will implement the same power regulation circuit and output drivers as the Ren48LSD and the 32-channel dimmer circuit from Ben but expanded to 48 channels. I have a board layout mostly complete but it's still a work-in-progress. It will be just a bit smaller than the current Ren48LSD.
Greg (Mr. Helix) was kind enough to provide me with some test code to expand the 32-channel code to 48 and flipped outputs to drive the transistors. I have the circuit running on a proto board with this code and so far so good. The plan is to implement Bit Angle Modulation (BAM) dimming and individual channel dimming curves so it should have really smooth/linear fading properties when done.
I will be updating this post with schematic/board changes.