You have a clever son. This looks a neat solution for the SMD challenged.
I would advise against using the tunable TCXO. The stability may be better with a non-tunable one and any frequency error can be corrected through adjusting the pluto offset setting. This setting is held in flash and retained on power cycles. Also be aware some TCXOs tuning voltage moves the frequency in discrete steps so you will find setting it exactly not to be possible for those devices.
thanks for your suggestions.
I was not aware that the Pluto could also permanently store correction settings in flash. I thought it would always rely on external software to do so. But you know - some hams like to turn knobs and not hack something into a console. hi hi
The tunable version is widely in use (as it was widely propaged by Sigi DG9BFC) with no bad experience so far as compared to its fixed frequency counterpart.
I am using it since August this year in my Pluto openly wired (see photos attached) and once tuned to the right frequency it never had to be retuned so far. Also the tuning is really smooth and sounds very analog style - therefore no discrete steps in this model noticeable as it seems...