[LAD] [OT] 3ghz coax and soldering...

hi everybody! forgive the ot post, but i hope there are some brains to pick here. i'm planning a studio, and to make it future-proof, there is coax in every room. currently it's going to be used for rgbhv and composite video, but i want it to be future-proof for MADI and HD-SDI. the cabling itself is of sufficient quality, but i'm doubtful about the connectors. the whole installation has a star topology, so the worst case is * source * 5m or so of suitable cable * bnc wall socket * 20m installation cable (-63dB/100m @ 3ghz) * a ghielmetti patchbay (which includes two canare contacts to the patch cord and two bnc on the rear, unfortunately) * another 20m installation cable * bnc wall socket * another 5m cable * sink question 1: any hopes for reliable hd-sdi? question 2: how can it be that a kick-ass company like ghielmetti does not offer video patchbays that allow direct connection of coax installation cables, but require rear bnc connections instead? question 2b: is there an alternative for direct rear coax connection, thereby cutting out two potentially disruptive contact surfaces? question 3: i'm thinking of getting neutrik isolated bnc connectors (the d-type ones that are semi-recessed and thus well protected from clumsy passers-by). but their soldering lugs break the coaxial structure - cause for concern? question 4: do i really want to solder hf stuff (even though the voltages are not too high), or will it unsolder itself eventually? any recommendations as to procedures and tin? thanks in advance, jörn