Inspired by what I used to run on my Arrow. First post, not sure if I did that correctly. Only run a few games with this setup so far but they have been fine with the XL engine (not SAFE, just not a magnet for death either) and have 650+ Dmg. The MG have been handy for close encounters and for that extra bit of heat friendly dakka. I did make a STD alt removing the MG and most of the LA/RA armor as well as adding Ferro to manage the weight: Large Wub variant: Removed MG, small increase in leg armor, added Ferro and replaced LL with LPL. Non-MG versions are compatible with both 3N and 5D as well, though in the D you'll be placing the lasers in your arms (bonus mobility, but lose the shield status).
I tend to run this one with STD and MGs: It's my second favourite RFL. Right after the awesome PPC one