No, you don't need the trims if you are just doing the dash.
Personally, I'd go the extractors etc first. But your choice. $850 for a dash sounds a bit exy to me - I'd expect to pay around $1500 for a full fairmont interior (including dash, trims and seats)
BEM sits up under the dash - sort of behind and below the stereo. It's screwed to the inside of the dash - or maybe just the dash framework. It's a bugger to get to, that's all I know.
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The Hammer: FG GTE | 376rwkw | 1/4 mile 11.793 @ 119.75mph 1.733 60' (4408lb)
1 of 60 FG MK1 335 GTEs (1 of 118 FG Mk 1 & 2 335 GTEs).
Mods: Tune, HSD/ShockWorks, black GT335 19” staggered replicas with 245 & 275/35/19 Michelin Pilot sport 5s
Daily: BF2 Fairmont Ghia I6 ZF, machine face GT335 19” staggered Replicas with 245s and 275s, Bilsteins & Kings
FPV 335 build stats:
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Ford Performance Club ACT