Catio - outside enclosure for cats (Hatfield - School/Orvilla Rds)

Looking for a catio, any size. I have three previously outdoor rescue cats who now live inside and two are pretty content with that, they try to get out and when I don't let them they just mosey on. My need is for a very old feral rescue lady who desperately wants to be back outside but for her own safety needs to not be. I'm hoping to enrich her golden years with the opportunity to be outside without being in danger. I can pick up within an hours drive from Lansdale, PA.