Evening Etienne, my rod builder should receive the blank this week, and like yourself am deciding on guides and seat etc.
For me it's definitely minima high stand off guides, they are 30 percent lighter than ceramic guides and extremely strong , even unbreakable in normal use.
This is a must on any float rod over 13ft to keep weight down.
Tip ring would be 7mm sic anti frap.or even 8mm if you're using it for slider work.
Regarding the reel seat , this is where I'm undecided, as I would like to know the weight and feel of the blank.
If weight is an issue then Fuji ips or DPS OEM seat would be my choice.
If the blank is light enough then I would also consider an Alps cwg ai at 41gms. It puts weight in the right area for me and adds to the overall balance and feel.
I'm pretty sure that Harrisons will have the blanks action absolutely spot on.
So , it comes down to our choices.
I hope you get it right, and would like to hear your views when you've had it built and used it . Good luck