Nice pics, SSM! That's the right kind of lighting for Jabba too.
Here are a few WIP pics of my "smaller custom arms" project. This is all pretty rough, with just some green paint splashed on. I ran out of sculpt putty so his left upper arm is still a bit thin.
The thing about Jabba is if you really look at the ref pics, he's a bit like a t-rex - surprisingly small arms (though his upper arms do get quite chunky) and hands that aren't too much larger than a human gloved hand. That's why I felt like the old 2007 Jabba arms looked more in proportion.
Because they are bent, these custom posed arms are about 50% newly sculpted (the rest is a cast of the old arms,) but I'm doing a second pair of arms that's basically a full cast of the old Jabba arms that will be his resting-on-his-belly arms. I did a cast of the stock SSC shoulder joining area so these arms attach in the exact same way as the stock Jabba arms (they have an embedded magnet) - the new arms are pretty much the same feel and weight as the old/stock arms.
Sorry about the flat/bright lighting - Jabba and I have been through some trying times in the past few days so he's not in mood lighting position.
For me these custom arms fix the main issue I had with the figure - that the stock arms made where his upper torso meets his lower torso too wide, throwing off the overall proportions. This seems to thin the area where his shoulders are and makes him - to my eye - seem less "squashed down" - his upper torso seems slightly slimmer at the base and more verical.