So an entire new file manager to copycat the design of an already existing one. That's what i call innovation! From your mockups i don't see many things different from Marlin and gloobus-preview. Even the settings dialogs are quite a rip off. Some changes may be interesting but to create yet another entire projects, i don't really see the point. You'd better of submitting your ideas to the already existing projects you take "inspiration" from. But i guess it wouldn't serve the purpose of promoting a self debian/ubuntu spin off.
Anyway you already know that, it's not the first time i react on this matter.
Let's fragments nowadays gtk file managers tend to have the same looks, let's take a look at marlin, nemo, nautilus and even thunar: 4 similar Places sidebars, guess how many different implementations. Welcome to the 2% user market shares.
As you probably know, I was only responsible for doing the high-fidelity mockups and I only suggested some things here and there(the cloud storage and the transfers plus some ideas from my Nautilus mockup to be precise) the rest is Georgi's work. He was the one behind all the rest of the ideas(including elementary-style parts). In other words, my work here consisted of doing a paint job not engineering the program; plus, it'd be rude if I was asked to help on something and ended up taking over and changing everything the way I like.
If you haven't talked to him yet, it would be great to express your opinion directly as he's both the designer and the one in contact with the SoluOS developer. He might base it on Marlin instead of Nautilus.(ping me in G+ if you contact them )
On a side note, I do agree about the lack of an intuitive file manager. I'll fix that someday.