Hi there Dhirtan.
To answer 1 of your questions, Yes, Yes & Yes again it is absolute worth popping for GT's in those areas.
I almost wanna say its GT paradise you enter.
Patience, time, lotsa hard work, sore arms, lotsa walking will pay off & you will reap the rewards.
On the Forum & Net there is pretty lots to read up on wrt the basics of targeting them especially amongst the bricks & the tackle you require.
Obviously the bigger the GT you target, the stronger the outfit, & all I say its a personal choice when it comes to tackle, nl. The rod, reel, braid & lures you gonna use.
As long as it can deal with the bus GT's that might jump onto your lure & will snap crackle & pop your braid in a jiffie.....there are some serious monsters out there.
Just a bit of a advice, always gear up with backup braid & lures as & spare rod & reel.....you just might find yrself driving to the nearest t.shop to stocks up & return.
A friend of mine recently visited Bhanga neck, used 11' outfits & in only 1 eve was busted 4 times.
Now one can say or ask was he properly geared or ready as an angler ? Answer is Yes, but you never expect the worst scenario.