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Great job. It goes to show that anyone with a mind to do it can do so.
I have done several of these now, one by soldering and the rest with the same foam, pins and sticky tape. I have not removed the battery and cables on any of them and have had no problems. Of course, the devices were in normal power off mode while the connections were made and powered on again to install the jailbreak.
The TTL-232RG-VREG1V8-WE cable I used is powered from the usb port and has a built in 1.8v regulator so the I/O levels were set correctly and the voltage (V) lead was not required.
The Jim's microftx mode 2 has usb powered 3.3v I/O and should work safely with two silicon signal diodes in series in the transmit line. The two diodes would drop the tx signal voltage by about 1.4V. The rx side would most likely work as is. It is one way to avoid having to install a voltage connection.
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