I'm not into impression stuff, however BHD definitely did influence my choice of RIFs because there are some really cool scenes. Why do you think I run not one, but two m14s as well as not one, but two 1911s? One of the least practical AEGs (because the m14 is so damn front-heavy and working on the gearbox is torture) and one of the least practical GBB pistols (because the 1911 magazines are so tiny and therefore can't take that much gas). Not all at the same time, of course
(Honestly, its a combination of that BHD scene plus the all ghillied up mission in CoD4 where you use a suppressed m21)
Take this next paragraph with a pinch of salt, it's largely based on second hand anecdotal mutterings because impression kits is never something that has interested me in the slightest, but as I understand it historically you come across some of the biggest cnuts around in those circles. Just turns into a weird dick swinging contest where folks would seemingly rather laugh and berate you for getting something wrong rather than help you get it right (if that's something you're inclined to want to do). Just seems like a really gatekept thing rather than coming across as a community that actually wants folks in it, that's my potentially ill-informed take anyway. If impressionist stuff is your thing, more power to you, it's not something I truly understand the motivations behind because it's not something that appeals to me.
TLDR - Yum yuckers are the worst, myself included.
I will echo what has already been said here. I've seen a lot of gear-gatekeeping. People making these arguments about "no, you're loadout is wrong because that rig is actually from 2 years earlier" are often really annoying to me, because I see airsoft as a great hobby because we can all play it our own way. I dress up like a bush and sneak around with a silent HPA rifle and silent mk23 sidearm, making silent shots and not really affecting the game in massively direct ways; it's hide and seek with BB guns to me. Others grab their AEG and go super high speed, gunfighting over objectives and clearing buildings. Others set up their support gun and hose entire areas with thousands of BBs. We all have our own ways of playing, which extends to our choice of dress up. I'm also a fan of real-steel shooting gear, but I'll never berate someone for buying cheapo gear because it's what they like. Airsoft loadouts are very personal and nobody can really tell you that you're doing it wrong if that's the way you like to play. One of my m14s is super heavy, as I put a bipod and a rail handguard on it, with people saying "oh you can't do that because it'll make it way too heavy and impractical!" yet those same people will come up to me on a game day when I bring it out and say "wow, that looks really cool! What is it? How did you do it?"
What I'll also add to the discussion is that I took a long break from airsoft from around 2010 until around 2018 and was shocked by some of the aspects of loadout building. People used to do impression kits all the time, but when I came back it was like "oh, that could be construed as stolen valor because you've got that patch". I get it, stolen valor is awful, but someone looking to make a relatively authentic SAS impression loadout because they played CoD4 and thought it was cool is not the same as someone putting on the uniforms and bragging about how they were in the regiment when they really weren't. I did an SAS inspired kit about 13 years ago because I played a lot of CoD4 and thought it was cool, but I never pretended to even be in the forces; it was all part of the dress up, like a costume.
TL

R - You do you. Make the loadout you like and you think looks cool. A lot of airsofters (I'd hazard to say the vast majority of airsofters) are lovely people and will likely think what you've done is cool and ask questions about it. Nobody will care if it's not 100% genuine authentic Delta with all the gear being surplus that was actually in Mogadishu and actually worn by that specific soldier. As long as it captures the look, people will notice and probably compliment you on it. Us airsofters love to talk shop about loadouts