This may inspire . . . I just removed the dated vanity and WC from our en suite shower room last week - pics are as the new items installed and the old stuff propped up to photograph for FB Marketplace (Response in 7 minutes from listing, collected within the hour, £50 cash!)
The vanity unit with sink and tap was £275 from IKEA, WC was £150 from Victoria Plum . . . and about £10 of odd bits to fit it all (less the £50 from the sale) So, pleased with the result for not a lot of money - we did have the advantage that the room was totally tiled on the floor and walls floor to ceiling. The quirky sign is to cover an aperture with a live electric supply that powered an awful mirror - mirror is now on the side wall)
I've also made a floating shelf from some offcuts of plywood laminated together and a set of brackets that were a £6 from Amazon