KevinKN wrote So you probably noticed i have not written down a cooler.
I was considering getting a closed water cooler loop with radiator/fans however, i decided i wanted to try the stock cooler for Ryzen as i have heard good things about it, however i do not know how smart that is.

The included cooler with Ryzen CPU's is adequate. However, with a £500 CPU, I'd probably recommend investing in an aftermarket cooler. A nice £50 air cooler will do the job just fine.

KevinKN wrote Furthermore i decided for a Strix x570-E ROG for the reason of having integrated wifi (was originally going to use a separate wifi module but changed my mind) however i do like the fan headers and rGB headers on this board as i do need the extra POWAAH generated by the RGB. (PS i enjoy the 128 GB RAM compatibility in case i decide to do that in the future for fun)

That's a really pricey motherboard. The Asus X570 TUF is a good bit cheaper, and there's a Wi-Fi variant of it, plus you still get Asus BIOS which is a win IMO. I think the X570 TUF might not have an addressable RGB header which the Strix does, but both of them have a normal RGB header anyway. Pretty sure they have the same number of fan headers as well, if not then the Strix has 1 extra but you can use a splitter anyway.

KevinKN wrote I decided for the NZXT H700I for having a lot of working space at the same tI'me of not having an oversized case but having the opportunity to fit in radiators with ease if it comes to that.

The H700i is really over-priced. It'd make more sense to get just the H700 for £125, but I'd get a different case. There are better options. You don't really need a case in the £120-200 range though IMO, cases in the £70-100 range have come a long way in recent years and are more than adequate for the vast majority of users.

KevinKN wrote Then we got the 750w Power supply which i decided to go fully modular with as i am planning for cable mods. However i do not really know if 750W would be enough for this rig and i belI've i might need some advice on this.

750W is unnecessary. A good quality 550W unit would be more than adequate in fact

KevinKN wrote And lastly i chose the MSI optix screen as i really loved that monitor on my previous
rig.

I wouldn't get the 1080p variant, especially with an RTX 2070 Super and £500 CPU. I'd probably look at a 3440x1440 ultrawide, preferably 100Hz. Alternatively, the MSI Optix 1440p144Hz monitor is a great choice for £350.

KevinKN wrote Then theres the Trident Z 2x 16 GB for extra RGB generated FPS for later being able to upgrade to trident Z 64 GB.

Essentially what this build is going to be used for is streaming/recording while gaming, 3d modelling / anI'mating and video editing.

Okay, so what program are you using for video editing? You should probably be using GPU acceleration for that, so the 12C/24T 3900x won't be that beneficial IMO. Are you going to really utilise the 12C/24T in 3D modeling/animating? Or would 8C/16T be sufficient? Also, I imagine the 32GB RAM will be utilised in your workstation tasks? As it definitely won't be beneficial in games. Honestly, RAM has come down in price enough that buying 32GB just for the bants is kinda fine tbh. However, if you're going to be fine with 8C/16T, I'd definitely save some money and grab the R7 3700x instead of an R9 3900x.