Re details on new Linkspan
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With reference to the three months shutdown, not a builder or engineer but working in a tidal area for three months is surely plenty of time to remove old Linkspan and build new much larger Linkspan and related structures.
Ferry service could obviously use Pembroke for the time building works are going on as boats no longer on same timetables.
To be fair to Fishguard having been in Holyhead, Dublin Port and Rosslare, there is not a lot wrong, my only potential issue is the lanes in the marshalling area while waiting for the ferry are narrow, cars have got much bigger over the years (also some of the people using the cars seem to be bigger !)
They have two nice modern waiting areas, one before and one after check in and refreshments are available, they even have a foot passenger gangway and a train right beside the ferry, not too many ferry ports can offer that now.