When I bought my house (almost a year ago) I noticed in hot days that
there was an odd, minging and familiar smell in the bathroom and
kitchen (below the bathroom).

IEventually I stripped my kitchen ceiling pannels away only to
discover a few damp marks where leaks occured. The dark ones did not
concern me too much, but the white one did. The white patch looks &
smells like crystalised urine and is right under the toilet so I
ripped the laminate flooring to reveal a few crystally urine marks.

My plan now is to unscrew the toilet, remove the toilet (I don't have
a clue how to do any of this), remove the floorboards in the area and
assess the damage. I will probably need to remove the fibre glass
insulation in that section and replace they plasterboard on the
kitchen ceiling.

Can anyone see any flaws in my plan?

Thanks in advance