How Admiral-class carriers would reshape dockyards

Would one Hood and several Admiral-class carriers force Britain to build larger dry docks?

Yes; multiple ships larger than G3 and comparable to or larger than Hood would require expanded dockyard capacity in Britain and perhaps the Far East.

G3 was designed around existing dockyard constraints, while a completed Admiral-class carrier could exceed those dimensions. Hood already had only a small number of suitable dry docks, including one at Malta. A fleet containing several such carriers could not depend on that narrow maintenance base. Additional dockyard investment in Britain and possibly the Far East would be necessary, showing how ship size creates long-lived infrastructure commitments.