Di2 GRX Build Big Shopping List / Wheels / Dropper Post Advice

My cross bike is showing it's age and I fancy building up a completely new bike. Usage is do anything, just leave the front door and hit any road, track or trail.

Frame will be Dolan GXC (27.2 seatpost)- https://www.dolan-bikes.com/gxc-carbon-gravel/

Never used Di2 - just about getting my head around it and have settled on GRX 2x11. Doesn't look like I can just buy the whole groupset off the shelf so it's a case of finding what I need in stock and buying all the fiddly bits.

Shifters, brakes, derailleurs, chainsets all sorted

Di2 list of bits so far - does this look correct?

BT-DN110 battery internal
EW-RS910 Junction
EW-WU111 Di2 ANT+ transmitter
SM-BCR2 Di2 charger
Various wires
Think I need another junction but not sure which

I've also seen various methods of keeping things rattle free inside the frame. Definitely don't want rattles! What's the deal here what do I need?

Rotors - just stick with shimano RT800, any other offerings to look at? Build quotes up 140 and 160mm.

Wheels - would like something robust and a bit bling, budget approx £450

Dropper post - really like the idea but don't want to add too much faff and bulk. Would have to be 100mm drop to be worth it.

Any experience and advice welcome. TIA


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