Really? Make a fully featured modern DE/WM/Compostor in electron that fits into 128MB of RAM and runs at 60fps on a Pentium III in daily usage then with a suite of apps.
Or better yet, make a web engine from scratch, that is, write the rendering engine, compositing engine and so on using Electron primitives.
Because both of these work very well when using Qt as a base, see LXQt and KHTML.