EDITED 14.03.07: The original posted build: GRF-1S ...this was basically a thought experiment to see how much energy damage I could pack on to the chassis, while avoiding ghost-heat. Turns out that arm is entirely too fragile (lose it, and you're done), and the weapons are mounted too low to be effective in many cases. Verdict: Run this variant as a missile boat instead. This was a bad idea (Mods, feel free to delete the thread).
XL275 comes with several mechs (SHD-5M, WVR-7K, GRF-3M and Heavy Metal), I think that's why he uses this engine. Here is GDCarlyle's build with the good engine, and armor shaved a little to mount a jet: edit: anyway, this build is obviously too hot.