This is with a rather limited selection of forces available, but see what you think:

Turbine
-- Snow's Fuser Rifle
*** River Charger
** EF Cloud Griffon mount
* Dwarven mechanic (to fix Turbine, y'dig)
** Khamsin Artillerist
* Dwarven Axeman

Weighing in at 299 points. Turbine and crew pick off enemies at a distance, the river charger flies around grabbing objectives.

I am pretty confident in the inclusion of the River Charger on the griff, but everything else is up for grabs. I do have an EF Stag, but the terrain doesn't really call for a pathfinder. As far as uniques go, Turbine is the only BPR unique I'll have, and I have no EF uniques. Relics are pretty limited too. I know I'll have a real hard time if somebody drops an avatar or a tricked out Varatrix or something else like that on the table, but that's going to be true no matter what I use out of my collection. I just want to have an army that works well together and is true to the theme of the scenario.

Somebody point me in the right direction here, I'm still getting the hang of this.

i heard that your not allowed to use relics that have factions as a requirement for this tournament
and i believe snows fuser rifle has a BPR wielder requirement

I think that's only true of the Apocalypse side, because they lose all their old faction symbols. I don't see anything in the scenario description that prevents the BPR from using a BPR-only relic.

But looking at the scenario more closely I seem to see hindering terrain. If that's so, then I may have to rethink this army, quite radically perhaps.

bah, edit time limit... that's terrain piece "H", a tower, not hindering terrain... nm...