Ok I would go to a bigger tank than a 40 --- optimal is 120 gallon but a 75 will work --- I would look at these websites for tanks -
4x2x2 120 Gallon Reptile Enclosure only $269 shipped, made of PVC, easy to assemble in minutes, extremely lightweight.
dubiaroaches.com
After listening to feedback from our customers, we have improved the construction of our original 120-gallon reptile enclosure to include additional structural support and sleeker features! Our newest enclosures have just landed at Symton HQ and we are working our hardest to get them off to you...
symtonbsf.com
www.zenhabitats.com
or you can try looking on fb marketplace for used tanks or craigslist --
the smell is going to be bad enough to drive you out of the room --- please make sure your UVB is up to par NO coils they are inadequate and you are using digital probe thermometers for surface basking temps --- a good solid clear bright white basking bulb --- NO daytime bulbs please no colored bulbs please -- if you need more help please ask --- I think the poop looks fine now it will change w/ diet changes etc ---