What I am doing with the next version of the Dynamo 360 is adopting the layout I want going forward (2 AC-DC inputs, 2 PCIe Outputs, 4 pin Dynamo Mini/19V Passthrough and JST SATA header like on the Dynamo Mini) but taking a miss on the merging function due to logistics/cost/timing. While it is planned for a future release, a revision of such magnitude will cost me a significant amount of time and money in development that I just can't spare right now. Also I am completely sold out of all Dynamo Mini and Dynamo 360 units at this time and need to get an order in ASAP or risk losing any market momentum I have. As an aside, a huge thanks to everyone who has supported me through the first run of PSUs. It has been even more successful than I'd anticipated and I look forward to bringing you all even better products in the future.
What I will be doing for revision 2.0 is adding a single/dual input mode on the Dynamo 360. In single input mode, DC-IN #1 will power everything including the Dynamo Mini via the 16-24V passthrough as well as SATA (essentially the same function as the version 1.0 unit). Dual AC-DC mode will be activated via jumper and will make it so that DC-IN #1 will power only the PCIe plugs while DC-IN #2 will power SATA and the 16-24V passthrough. While this won't be a true merge, it will allow you to have an HDPlex 400W AC-DC powering your GPU exclusively and then an HDPlex 160W AC-DC (or 80W AC-DC) to power your motherboard/CPU/SATA. The hopes is that by distributing AC-DC load you will be able to keep thermals down inside of smaller enclosure while reasonably being able to build with a 600W power budget.
I am also aiming to have the unit sync power on/off via passthrough or PCIe power draw so that the sync cable is no longer required in any situation. This would also eliminate the rare situations where system power down leaves fans spinning and LEDs on.
As far as doing a merging unit yourself, please feel free to do so and let me know if I can help. While it is still on my radar to do one, I basically spent the first half of the year running myself into the ground financially doing the design and implementation of a SFF based wearable PC platform. I'm rebuilding the war chest between now and the new year having put that project on ice so I can focus on more viable products.