Klipsch or other high efficient (95 db/w/m) or more will get your workspace excited. If you are focusing on work, it may be loud enough. The steel walls will be very reflective. Corrugation will help. More distance you have from the walls is a benefit.
Using something with sound absorbent qualities at the 'points of 1st reflection' within your room will be a great help. These treatments can mount on walls or hang from chains like you mentioned. Some good instructions can be found in the room setup guild from the C1 preamp. The same treatments recommended for best sonic holograph actually applies to all audio set-ups. Page 30.
https://thecarversite.com/manuals/mandir/Carver C-1 owner manual.pdf
Points of 1st reflection in listening rooms. Treat those for great improvements in any room. Great bang for the $. Can be DIY..
https://www.gikacoustics.com/early-reflection-points/