I really didn't find making a dongle too tricky. Here's some pics of my ugly dongle
I'd decide that I only wanted to make one dongle for most uses so I felt that a switch on the 1/8" input for plug in power and the 1/8" socket were justified. Of course if I'm going to use phantom power I'll make another with just 2 TRS 1/4".
To make it all I did was find a small piece of plastic around the house (it actually came from the bottom of an old case), I cut it to size, plugged the jacks into their respective sockets. Placed the piece of plastic in front the jacks and marked the centre of each jack on the edge of the plastic (in the frontal plane), i then placed the plastic on top of the jacks to give the centre on the lateral view (note 1/8" jack is slightly anterior to the 1/4"'s). Now having found the centre of each jack I drilled the holes which were just the right size to allow the jacks to screw into the relatively soft plastic and cut it's own thread. Then i plugged the assembly into the MT to make sure it fitted.
Following this I wired up the jacks, socket and a switch to turn on/off the plug in power from the 1/8" to the 2X 1/4"'s. Plug it in to check it works. Then I made a mold with with electrical tape around the edges of the plastic and filled it with hot glue. Finally covering the whole thing with electrical tape for my own odd bodgers asthetic, with the all important dollop of the wife's nail varnish to indicate the on position of the swich.
Oh I should note at the start i took the cheap 1/4" TS jacks I had and cut down the posts to which the wires insert and drilled new holes much closer to the base of the jacks to save space.
All in all if you have a soldering iron, some wires, electrical tape, hot glue, a drill it's a pretty easy bodge and there will definatly be no noise due to movement.
Of course if you're only using two 1/4" jack the builds even easier all you have to do is space your drill holes centred 14mm (from my measuement) apart thats all that matters!