The Longbow Medium Mech weighs 50 tons and was designed for long range Fire Support.
The standard Longbow is armed with two ER PPCs, two LRM-12 batteries, two medium ER lasers, and two machine guns.
It has a large engine for quick energy weapon recharge times and good speed.
However it has minimal armor which explains how this much long range punch gets mounted onto a medium mech that weighs only 50 tons.
Design Notes: the Star wars Naboo Fighter 7141 is a great source for yellow parts.