Hi Hero,
I agreed, 555 and 4047 are old. but they do almost everything in low freq square generator. Easy to find and very cheap. Did you have special memories with 555?
Hi Ebuka,
You may used 3000VA from audioguru's shematic as PWM (as hard switch). It using mosfet switch with charge pump for high side driving. Just replace the input with PWM (low freq PWM, 1KHz or near).
But better make it for low power first (might be just 10W). Its more save for your first try.
If the schematic too complicated, the PWM are more complicated. So, please do it step by step.