New custom loop

[Max1975]

Hi all, I'm new about water cooling custom loops and I'd like some advice.
I've a Corsair Obsidian 750D Airflow case with AMD ryzen 7 3700x cpu (future upgrade with a ryzen 7 5800x3d)and radeon rx 6900 xt gpu.
Actully I've a Corsair AIO with 280mm radiator for the CPU and I want to liquid cooling the gpu either.
I looked at the shop and my idea are:
Cpu -> Alphacool Eisbaer Pro Aurora (Solo) - Digital RGB;
Gpu -> Eisblock Aurora Acryl GPX-A Radeon RX 6800/6800XT/6900XT Reference with Backplate;
Reservoir+Pump -> Alphacool Eisfach - Single Laing D5 incl. Alphacool Eispumpe VPP755.
For the radiator set I would choose:
1 - Alphacool NexXxoS ST30 Full Copper X-Flow 280mm radiator - Frontal intake;
1 - Alphacool NexXxoS XT45 Full Copper X-Flow 240mm radiator - Bottom intake;
1- Alphacool NexXxoS XT45 Full Copper X-Flow 360mm/420mm radiator - Top exaust.

For the tube diameter and connectors there's too many I don't know who is the best.
The questions are:
- The choosen parts are right and enough or I'm missing some?
- One pump or better add another one?

Thanks and sorry if I've make any mistake.
Kind regards