Funny you should say that, I actually think that the Dunecrawler is more like the Sentinel, with it's sloped front cockpit looking very similar aesthetically.
I organised a scratch match tonight to try the list out. I ended up facing a mech/bike ork list that was into the assault on turn two, and the list, understandably, crumpled. I only killed two trucks on turn 1 thanks to some poor rolling (didn't go first) and while elements like the flamer speedbump, reserve scout sentinels and holed up veterans worked... they didn't work well enough. Even my three plasmacannon sentinels failed over three turns of shooting to take out the warboss, though they did get a bunch of his protective boys.
I'll put a picture of the force up (less reserved sentinels) tomorrow.