Actually, it's good that you're replacing the tools with your own. I'm sure that sooner or later, Hammer Editor will have to be removed and only Map Editor will remain. Anyone who wants to can create own mapping tool
That's exactly why I really like s&box. It's an engine and platform, and it's also open source, which gives you so many possibilities
Special thanks to lolleko for the high-quality screenshots and Tony for the random dresser (although I wrote it back in the summer) Now we can make even cooler previews