CSS Missouri was laid down in 1862 near Shreveport, Louisiana, and commissioned in 1863. She was built from the keel up, and shortages to materials delayed her completion to some degree. Despite warnings from locals that the water tables in the Red River could be "unpredictable," the CSN went ahead with her original construction plans and built her with an eight feet draft. This would have been more than sufficient for operations on the main waterways, but many sections of the Red River are seasonal, and as a result of an unusually low water table, she spent most of 1863 and the first half of 1864 trapped in the area near Shreveport. While the actual reasons are unclear, this may also explain why two sister ships, ordered at the same time, were never begun. Despite orders to engage Union forces during the Red River, she found herself unable to do so, though a cutting out party using crew from Missouri and the Web did make an attempt to seize USS Rattler. When water levels rose again, she took to the main waterways and was stationed near Alexandria, Louisiana, where she acted to provide local defense. In April, 1865, she surrendered to USN ships advancing on her position. Though often credited with being the last of the Confederate ironclads to surrender, this is actually not correct; CSS Stonewall was the last to surrender, doing so in May of the same year. .
Missouri had an unusual design, and there is some debate about whether her rear wheel was protected. She had been designed with an armored wheelhouse, but a period account claims that this wheelhouse was not finished; another period account, and sketches of the ship seem to indicate otherwise. The truth is probably that the wheelhouse was initially unfinished, and that it was later added as more powerful Union ironclads became active in that part of the Mississippi theater. I have chosen to model her with an enclosed wheelhouse. It's interesting to note that a fairly prominent source says that the CSN considered Missouri virtually "worthless" as a warship. While her CO was never happy with his posting, and even went on record saying he hoped that "the damned ship would sink" so that he could go home and be done with it, there is nothing I've located that seems to substantiate claims that she was worthless as a warship. Her very presence was considered a significant threat by the Mississippi River Squadron, such that one or two ships were usually stationed near the Red River to respond in case she attempted a breakout.
Historically, it is likely that Missouri was unpainted. However, some modellers choose to render her in lead grey.
Missouri has printed well in WSF, though as usual I recommend giving BSF a try if you'd like to avoid some of the texture issues that occasionally arise when printing in WSF plastic.