Allow me just one constructive criticism, it is to be appreciated a painting job of multiple pieces, but the molding lines are something really ugly to see unfortunately.
Since all your lasers are in one location, I’d be tempted to go with a large re-engineered laser, or find another ton and do a binary laser or large variable pulse laser.
Why decrease the overall tonnage by 5 tons? You actually loose tonnage that could be put into weapons or armor versus the 60 ton frame when making a 4/6 BattleMech.