A lot of kitech's work was in making the large C ABI wrapper. There's another C ABI wrapper already in Debian (libqt5pas) that might be possible to use directly.
I really like this too. Qt Widgets offers this too, with the Qt Designer app. It's really easy to use, just like Delphi, Winforms or old VB6.
The Qt Creator IDE has integrated designer and also LSP support for Go, an integration could be really interesting for rapid development.
It does work, but I had hoped for more, it is simply too far behind in many ways and is stuck on GTK2 (so no high DPI support). The LCL itself does support GTK3 and Qt5 (and nothing newer), but recompiling GoVCL to use them broke quite badly.