It seems that the force field problem is approached from the wrong end. Instead of trying to create a plasma or or field that is solid enough to resist penetration, we should take a lesson from nature. Solid matter is, essentially, a force field matrix with nodules suspended at regular intervals. The trick, then, is to recreate the effects of solid particles and interweave the charge and inertia effects, simulating solid matter's suspension forces without the nuclei..
In other words, it isn't a power or field problem, but a geometry problem with power and field requirements.
Start with a phased array transmitting skin and keep modulating the energy output until the generated fields interlace and appear to be solid titanium for all intents and purposes.
Instead of "transparent aluminum", it's pseudoluminum: non-inertial metal.
I can come up with this stuff all day long ;)