Anyhow as usual style nobody has helped Kirk out...

Thanks for putting it back on track.

I expect (hope?) the Naviter guys would primarily want to do their
own wind

Correct. We all know that the wind in SN-10 is great. But there is no
reason to duplicate this wind on SeeYou Mobile if you already have it
on the SN-10 conveniently. We try to do our own thing from available
data. AFAIK true or indicated airspeed is not available in SN-10 NMEA
output which means we can't compute the wind in straight flight when
connected to the SN-10. Knowing the limitations of your gear it may
still be beneficial to be able to compare two completely different
methods of computing the wind in a thermal for example.

Back to the original question:
Wondering if it is worth the trouble to have a new SN10 wiring harness
made to work with my PDA.

Due to the lack of TAS/IAS in SN-10's NMEA the only benefit is the
vario data that comes from the SN-10. This data will give you better
Thermal Vario (VarT) and much better Thermal Assistant analysis if you
use these two features. If you don't there little or no benefit
compared to being connected to the Volkslogger (assuming that you
connect SeeYou Mobile to VL at present).

The user forums at Naviter may be a better place to get help.

True. Posting there helps other pilots answer their own questions
while we are away flying.

Andrej