Giving players a power trip, without utterly derailing everything

By Darkmittens, in Dark Heresy Gamemasters

So, in my group we have the issue of the need to do hollywood movie badassery standing off against my need for control of a situation (which i frequently relinquish in the name of the latter). Now i have come up with the safest way to give my players a feeling like the world is thier playground of destruction and the largest force that stands against them is but a little bullet holed wreck given enough time.

I give you the X951 pattern Lathe mech walker, with more guns than a Imperial guard commander would shake a stick at... and thats a lot of guns.

Structure points: 50
Armor: metal plating (10 arms and legs, 12 on body, 9 on head)
Movement: agi bonus= number of sucesses on a pilot (walker) test (if untrained simply treat as basic)
Weapons:
Arms: (Left) Quad linked Heavy Stubber (120 M, -/-/40, 1d10+4 I, Pen 3, Clip 400, 2 full reload, quadlinked (every degree of sucess yields 3 extra hits, also takes up 4 times more ammo, already included), reliable), underslung flamer (15m, S/-/-, 1d10+4E, pen 2, clip 10, rld 4 full, flame)
(Right) retractable electro coils (1d10 +14 I, pen0, Flexible, shocking), Fist (1d10 + 12, sheer strength (counts as having a power field when parried, but is still seseptable to a power weapon on a natural 1 on a d10)), Combat Mech rifle (60m, s/3/-, 2d10+4, pen 0, Clip 50, 2 full rld, scatter, reliable), underslung RPG launcher (affixed as bayonette to mech rifle) (120m, S/-/-, damage and pen same as gernade, Clip 1, full rld)
Body: 2 Voss pattern gernade launchers (loaded from interior, so you can select type of gernade from store) (60m, s/-/-, damage and pen same as gernade, inaccurate)

Gear and outfitting tools:
Arms: lascutters array,
Body: re-breather, Infra-red goggles, Chrono, Grapnel (to get out in a pinch), Pict Recorder, auspex, glow globe, headlights(count as optical mechandrite)

What do you think?? is it fair, can i fight aliens in it without having too much problem, Are there weapons i should add, i almost feel like i should add some variation to include a thermal lance instead of the mech rifle, and then also a plasma cannon or heavy flamer.. those may be different patterns though.

It reeks of Tech-Heresy!

What about letting them run wild with a squadron of Sentinels for a session or two? Plenty of weapons variety and high mobility aggression in a nice neat package that does not include mandatory servitorization when the priesthood of Mars finds out about it.

My 2 Thrones worth...