Guinea pig hutch extension/run ideas

Hi ladies, i have a 5x2 single storey hutch that currently houses 2 guinea pigs and was thinking of adopting 1 or 2 more piggies from the shelter soon. However i am out of ideas on how to extend the hutch that we are currently using to maximise the space and save money. I have an indoor cage and was thinking of attaching it to the hutch as extra floor space... was thinking of using the wire door/ramp of the indoor cage as a ramp for the guinea pigs to move in and out of the wooden hutch and maybe attaching the cage to the hutch with zip ties 🤔 not sure need some ideas please and even photos of your setup