That floor can be replaced in 1 day by a pro,it is a pretty indepth job and slide must be supported and extended out to replace the floor.It would take me hours to explain,in depth. There is a video on u-tube that does a pretty good job of showing how to support the slideout,what pieces to remove,and the method of replacing the floor. go to u-tube,search rv slideout floor replacement.
The video has three older guys,they look like bikers,that know what their doing.
I hope this helps,if you can't find it,I will try to explain,in depth for you.
ps The best way to replace the floor is by removing the slide completely,but it can be done in place with slide in the out position.
2013 Fleetwood Terra 35K