I note the GSV image shows small gates which are split across the tracks on each side. Your image at the start of the post seems to show a new gate spanning the tracks in one section.
Thats right, we are converting the crossing from 4 gates to 2 large gates. This will mean the signalman can operate the gates on his own in future, will also make locking across the road to be able to clear the railway signals easier.
The red side of the lantern is what they used to do years ago to give a warning to road users that there is a crossing there. I supose its not essential in this day and age.
The frosted glass is a good idea, as is using a PL-L lamp or similar, even though I really like MBF, I can see that using a modern lamp is essential to reduce the running costs. (Carmarthen council has started to use PL-T burning Opalos for replacements on side streets, paths etc, I think they look brilliant, certainly my favourite 'new' lantern!)
Mike