I would like to design my own insert in combination with the Fluidic Connect Pro holder. Can you provide relevant information?

It's possible manufacture your own inserts for the Fluidic Connect Pro, however perhaps our insert set which is more flexible in chip length can be a good alternative or starting point? This product can be found here
In design of your own insert set there are some attention points:

• Always keep the total height stack (chip tickness + inserts height up to the holder frame) comparable with our default inserts. Our inserts are designed for use with a chip tickness of 1.8mm (without metal spacers with a thickness of 0.6mm).
• Keep using our special ferrules. The ferrules will absorb height differences preventing large forces on the holder. The Fluidic Connect Pro concept is NOT compatible for sealing without elastic material in the height stack. Be also carefull with large sealing areas, typical the distributed forces are too less for good sealing.
• Do not seal on top of elastic materials, like PDMS. The applied force might compress the channel structures. In this case it's best to interface on the rigit side like on the glass layer. This will better distribute the force preventing shape changes of the elastomer.
• Some time it helps to order an existing insert set as visual example.

A drawing of the Fluidic Connect Pro (frame only) can be found here.