Engine worth about £500-£800 if you prove it's a good runner before you take it out.
Frame worthless as who the feck ever needs one. £200 if you get lucky
Wheels and forks a few hundred.
It will take you hundreds of hours of work. Then cleaning. Then dealing with selling, posting, blaah blaah blaah.
Breaking bikes ONLY works if you scale up your operation massively. Otherwise it's never ever worth it.
Your bike is worth far more as a running bike with an MOT.