I think the main reason was cos she was too useful as a sea plane carrier off the west African coast. I suppose by the time she was converted the American CVEs was arriving and there was probably lack of dockyard space in UK . I just saw the plan and couldn't resist. Credit has got to go to Bill's and Kim's original drawing and Hoods great aircraft and parts.
Nice work on the colourised, ship bucket style images. The original one used as an inspiration was one that I modified from a design shown in a copy of the Australian Navy League magazine a few years ago (I can't recall the original author at the moment).