we made a briliant new indoor run for our guineas this weekend - we've got 4 and now they are about 4 mnths old the original indoor (large) cage we got is definitely too small so I took the advice on www.cavycages.com and built our own. out of wire grids and cardboard (temporary base). I got the grids from B&Q in their storage section after searching the web and not finding any anywhere.
total cost £24 for a 5 x 2 (grids cage) - its a bargain and our guineas love it. I won't feel guilty now if I don't put them in the outside run for the day .