Hi Arrigo,
Oh yes, you and I have been on the same forums, on and off, since the dawn of the internet!
Re the 6pdrs: I think the reason they got the 'press' at Arnhem is because there were a lot more of them and they were primarily at the sharp-end of the battle, with a troop of four guns being assigned to each Para Battalion. In addition to the RA 6pdrs, there were also the two 6pdr AT Platoons in each of the three Airlanding Battalions (KOSBs, Borders and S Staffs) and the Polish AT Battery, which landed during the events described in our scenario.
As it happens, the grandfather of my old Warrant Officer was a Sgt in charge of one of the 17pdrs. He also used a borrowed Universal Carrier to drag a 'lost' 17pdr out of a wrecked Hamilcar and get it into action. Even though unwounded, he was one of the volunteers who stayed behind to maintain the semblance of a defence while the division withdrew across the Rhine. He was last seen trying to bribe men with cigarettes and chocolate to help him man the gun. Sadly he's now in Oosterbeek War Cemetery and his gun is outside the Hartenstein, with a 75mm-sized hole going through gunshield and gunner's position (he was presumably killed by a Stug from Stug-Brigade 280).