Relatively low mounts means exposure to fire is fairly sub-par. Aside from that though, the Marauders are great 'Mechs, and this build is considerably more mobile (especially with JJs) than an equivalent Stalker build. I'd use the LE300, 18 DHS, 3xJJ version that @Excalibaard posted above. In addition to its mobility, the maxed armor values should allow it to spread damage quite nicely.