I'd say go for it. If it's just you and the wife,I'd only have 3 chickens,and you'll have to move the eglu every day,or every other day on the grass. The alternative is to permanently install a patch of bark chippings,straw or some other kind of litter to satisfy the chicken's need to scratch. Try googling The Balfour method,should only take up 4 square yards of your 100sq yards,and ya get all those eggs too!!!
Eglu's are quite an expensive initial outlay,so I think you need to be serious about keeping them long term,or don't mind a semi-expensive hobby. Rhode Isand Reds are my preferred breed for egg production,but that's down to personal choice,and I think your wife might have the last say on that subject
...... Ree