I'm modding my stick to work with 360/PS3, Dreamcast and also supergun, which means I need a Dsub connector as the supergun stuff requires 15 wires. What I'm actually doing is using a DA-26 connector (26 pins but in the same size as what most people call DB-15) and running everything to that and making up individual system cables.
This will help explain (since people often get the names of the connectors wrong)
And here's my wiring diagram to show how it should work.
I've thought about how I could go about this, and I've got a few options
My preferred method was to surface mount a DA-26 connector inside the cable storage compartment of the TE stick, and make up system cables, such as DA-26 to USB, or DA-26 or DA-15 using a low profile Dsub backshell like this:
The end result would be that once you've connected the cable for the system you are playing on, you can close up the cable compartment door and it would look pretty much like a stock stick, just with a different console connector on the end.
My concern with this method is the quality of the plastic inside the cable compartment. A friend of mine said he would be worried that it would crack, but it seems strong enough to me. Also it would be rather fiddly to mount or cut out the connector shape into the cable compartment, but looking at it, it looks like you might be able to tear the stick down and remove the cable compartment box completely to be able to work on it?
Another method might be to remove the existing USB cable and get some 20-something core cable and have it running out of the stick with the DA-26 connector on the far end (instead of where you imagine the stock USB connector to be), near the console, and then just make a short DA-26>console cable. Obviously it wouldn't look as nice, but it might be easier.
Finally, if I'm going to take my DIY skills to the cable compartment, does anyone have any tips on cutting the shape? I'm going to buy a dremel soon, so I guess the idea would be to drill some small holes in each corner and use the cutting disc, then sand it down after. I had contemplated getting some MDF or something first and making a template, so when I use the sanding head I can just grind away until I start sanding the template.