[John Sabato]

First of all, welcome to the Lugerforum...

IMHO, from your description of the cannons, their photos, and the history of their origin you have related, I would classify this Luger as a classic parts gun, assembled by one of the "early gunsmith" days tinkerers (no relationship to Ed above of course) and of no particular collector value,
...and the barrels appear to have been made from surplus rifle barrels... An interesting pair to be sure, but you don't have to treat them with kid gloves.

While is is true that Pacific Arms did install different length barrels on request, all of the examples that I have seen still followed the "standard" Luger barrel contours, and neither of these barrels exhibits that...

Enjoy shooting them... and please post close-up photos of the various stamps on the parts to satisfy the curiosity of the membership....