Because it is already in the game files :PGI:
Opened with Cry-engine
MAL-1R, aka 4*UAC5 is a go!
1*ER Large Laser per Arm
1*LRM15 & 2 AC2 per side torso
Sum: 2E, 2M, 4B
Ferro, DHS and a 270XL in the base variant.
All other variants are questionable how they are gonna work in MWO as all other variants have the same 2E & 2M & 4B hard point allocation and even have future tech: Sub-nose PPC or UAC2.