YES!!!
I was just working on a hand-guard similar to the one in the yellow assault rifle you just posted.
Also made some grips and other cool parts so it's very possible to re-create these beautiful guns using my blocks.
Thanks for the image, I've just added it to my reference folder, and I'll look more closely into the guns in Mass Effect from now on.
Either way they all look awesome. Here is a link to some I found that you might like. https://www.artstation.com/artwork/zAznZ6 Plus a few more photos. 
Yes, I use Pureref. I used to have tons of folders with individual images, now I have one file for each project, which is super nice. I discovered the software almost a year ago and it made my work much more comfortable.
Thanks for the link, those concept arts are sick, I especially love the big bayonets, lots of cool stuff all around.
For your modeling project, it reminded me of an interview with George RR Martin, the writer of Game of Thrones, the interviewer asked him what he would do if he traveled back in time and was young again while retaining all his memories, he replied saying that he would freak out and wouldn't know if he could write all those books again, he was afraid he would mess them up.
It's normal to not be able to replicate your own work, in fact it's a good sign that you're making progress. Making progress doesn't always mean that your work is improving for the better, sometimes gaining new perspectives will make your results worse for a while. You need to let go of your need to do perfect work, and just have fun. If I were you I would look at the reference image once, put it aside, open Blender, and just model whatever crazy stuff my mind comes up with.
Trying to make a model that perfectly matches a reference image can be super stressful, you need to blow off some steam. What I did when starting out was for every hour spent on precision modeling, I do at least 15 minutes of freestyle wild crazy modeling, where I would take part of the model I made in the first hour, and just go to town on it, add weird things to it, try and turn it into a menacing spaceship, add cannons, spikes, and all sorts of crazy sh*t. It was fun, and I do it as often as I can.
Here are two examples (from my own work) of what I just told you, guess which is the precision work, and which is the crazy stuff :
I don't really stick to a design unless I really like it. This one I really like but have not been able to replicate it so if you see any anything cool in this gun that you like then please go ahead and model away. Maybe I can make it again with your modeling parts. I will try it myself again though. Maybe I'll do it piece by piece and put it together.
Sure, it's a lovely design, so are the guns in the reference images you sent earlier, thanks again for those. I'm currently at 150 blocks, the range of possibilities is already quite significant, I'm confident you can build some cool guns with the kit already, I'll do my best to finish soon so you can get your hands on it.
