Looks great man, much better with the primer. I think my favorite part of your scratch-build is the helmet.

Bandai gets most of the credit for the helmet, I just took off the Gundam trademarks and filled the holes with MS!
1) Do you intend to detail up the inside of shoulder armor? Looks pretty empty right now.
Yeah, the thought occurred to me. The hard part is that the insides have irregular concave shapes. I put some MS in there to smooth it out. I'll probably try to insert some Kotobukiya option parts.
2) What's going to attach to the backpack? Some sort of crazy wing design with bits flying everywhere?
Just a simplified version of the original backpack with an ammo drum for the gatling, some antenna and possibly an over-the shoulder grenade launcher/mortar for shooting HE and teargas.
3) The face plate!! I want to see your face plate.
That makes 2 of us! :o

I'm stalling for 2 reasons. First, it's gonna be very small but very important I get it right, so I wanted to build up my experience in other places. Second, if I do the LED, then the batteries will be in the backpack, and that means running wires between them (which will double as the tubes that come out of the mask). They'll probably have to be permanently attahced to each other (the backpack and face), so I don't want these delicate parts getting trashed while I'm sanding and hacking other parts. They kinda have to go last. Unless I could find some tiny tiny electrical plugs!
What's that battering ram you mentioned? I don't know what it is but sounds good to me! 
The original Spiegel has places on each lower forearm to attach each of the long blades. The right one will be used to mount a gatling gun. The left one could be used to mount a kind of flip out and extend battering ram for knocking down walls. Then again, it could probably just use its feet for this. Maybe I'll keep the left blade??? I also have to look at what will fit around the signature Jin-Roh shield, which is very similar to the Patlabor shields.
I have general ideas for the JRP, but I'm making a lot of this up as I go. In part because as I become more confident with my scratchbuilding ability, I end up doing more challenging things, and because while I'm doing part Y, I just can't put my full brainpower on part X in the future. When I get to part X, I find that my decision-making becomes pretty clear. My favorite is when I wake up and an obvious solution hits me! Nothing beats sleeping on a problem...
