I originally had a draft here but had to force my PC to shut down due to a bug with an option I set a few days ago.

In a nutshell, I found a thing called FridayLight, from the five screenshots I saw, I liked what I saw minus a few things. I did like the GameBanana browser cool, and the UI kinda reminds me of Steam but better. I felt the "Download Custom Mod" and "Select Mod Type" could've been shortened and combined. (Mod type could be figured with a dropdown and such.)

While I did have my criticisms (no hard feelings), I set out on making my own design for one. Here's what I came up with:

All credit goes where due.