This is a great idea. It will buy you time AND give you materials to use for later.Chicks do not need a coop to go outside. When mine graduate from the brooder, they go out into a 6' tall (young pullets are very good flyers) enclosure that have dog houses and crates for them to sleep in. Chicks sleep on the ground in piles until they are closer to 16 weeks. Low practice roosts should be available but they won't use them to sleep. Don't need nesting boxes until they are 5+ months old.
4 10x6 chain link panels will run you $200-400 on CL. Throw a tarp over the top for some shade, pick up a free crate or dog house and you're in business. You've not wasted $400 on a coop that is only adequate for 8 weeks. You can use the panels for the run when you do build your coop. Panels make it easy to expand the run as you come across more for cheap.