I affectionately call this my "Boomhammer" https://mech.nav-alpha.com/#ad1bc2c2_WHM-BW Sure, It's slow but it is agile enough to deal with lights.
Being slow as an assault means you can't push if there is anything capable of dealing damage on you at range, plus you are either going to be left behind or too slow to chase or kill enemies left behind during a nascar. I strongly recommend drop anything on those arms and fit a better engine, so you can both be aggressive and deal some damage at range. Don't forget your main weaponry are LBX20s, so you need to get close fast or reposition to regroup and avoid an enemy death ball. I've kept some armor on those arms because Warhammer's arms are really good for soaking up some damage. https://mech.nav-alpha.com/#88987a5d_WHM-BW