Pompetamine SSCX Build - Advise needed!

Hi guys, I am building up an SSCX bike for use as a commuter during the year and fun bike for winter!

I have purchased a brand new black pompetamine frame and i am currently sourcing the kit to go on this. I would appreciate any advice from experienced cx bike users/ builders...

I have some experience building from frame-up (6 bikes to date) but these have been mtb's, road bikes and fixies.

I'm thinking the spec will be something like:

Frame: On One Pompetamine Black Large
Forks: On One Pompetamine Black (upgrade to carbon or Tange prestige later)
Headset: Chris King/ Hope 1 1/8" Black
Bottom Bracket: Truvativ GXP Team Dark Silver
Front Hub: Hope Pro2 Evo QR Black
Rear Hub: Hope Pro2 Evo Trials/SS (135mm) m10 Black
Rims: Mavic XM819 Disc 29er (UST Tubeless Ready)
Tyres: Continental Cyclocross Race 700 x 35c
Brakes F+R: TRP Hylex 160mm
Chain: quality corrosion resistant!?
Chainset: SRAM RED Chainset
Seatpost: Thomson Elite Inline 27.2 Black 400mm
Stem: Thomson Elite X2 Road Stem 100mm +/-10 Black
Bars: Maybe Tomson, 3tt or Pro?
Bar Tape: ?? (something durable in the wet..)
Saddle: Specialized Romin Pro
Pedals - Deore XT atb pedals
Rear Sprocket: Gusset DoubleSix Cog 18t ??

I would appreciate any advice/opinion on the parts I have not yet purchased.

Primarily the sprocket/chain, front chainring and possibly bash guard..?

Thanks in advance! :D

I have already ordered the following (pictured):

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