Nasty particleboard bathroom vanity

My vanity is old, ugly and has obviously soaked up some water at some point, so it's swollen and disgusting. I need to replace it, but can't afford the new ones at the home shops so have been looking for an old dresser small enough. Once I get it though, how do I cut it in such a way as to allow for the plumbing, when it will have drawers instead of cupboards? P.S. I do want drawers, which is why I'm shooting for a dresser.
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