I´ve been doing some research on the USS Susquehanna for almost 6 months now and have been trying to find out everything I can about her. I plan on scratchbuilding her in 1/96 scale. I´ve seen pictures of the models produced by Aoshima, Imai and Monogram and there seem to be some major discrepancies on these models. For one, I believe they based their plans on some of the available paintings and drawings of the ship. One thing to remember is that most of the artists of that time period either did not know anything about how a ship was built or they just made up certain details as they went along. These artist renderings cannot be taken as an exact copy of what the ship actually looked like.
Most of the models have the covering for the paddlewheels with an "NBC peacock design". That is wrong. The coverings had a verticle slat design inside of a half circle. This can be seen in Peter Barratt´s book "Circle of Fire" on page 210. It also looks like most of the models have single paddles on the paddlewheels. The Susquehanna had duel paddles. One above the other. The diameter of the wheels were 31 ft. 2 in. The width of each paddle was 9 ft. 6 in. and the paddles were 17 in. each in depth. There were 26 double paddle in each wheel. The dip of the wheel was 6 ft below the waterline.
As to the ships armament, most of her career, she had a complement of twelve IX (9 in) Dahlgren smoothbores, two 150 pounder Parrott Rifles mounted Fore and Aft on slide/pivot mounts and up to two 12 pounder rifles (which I believe were the Dahlgren Howitzers for the launches and landing operations) The earliest configuration states only that she was armed with three 8 in. shell guns (more than likely Paixhan shell guns) and six 32 pounder smoothbores. On December 31, 1865, following a major refitting, the 150 pdr. Parrott Rifles were removed and replaced by two XI (11 in.) Dahgrens. The twelve IX Dahlgrens remained in the broadsides and a 30 Pounder Parrott Rifle was added and the two 24 Pounder rifles remained.
Also not shown on the models was the so called "Hurricane Deck". This was a deck between the paddlewheels. This was where the ship´s staff would be during combat operations so they could have an overall view of the ship. It extended from one paddlewheel to the other and was the width of the wheels.
As to the correct placement of the cannons, the IX Dahlgrens were 6 Fore and 6 Aft. 2 were placed in the ports closest to the paddlewheels. The next gun port was left open and a single Dahlgren was placed in the next port. The same system was used both Fore and Aft. The 150 Pdr. Parrotts were on slide/Pivot mounts and were run on "Rails". The foward pivot was mounted foward of the Foremast. I am still not exactly sure of the Aft Pivots exact position. I don´t believe that the Poop Deck could have supported such weight. I tend to believe that perhaps the Poop Deck had been removed so that the heavy gun could be placed far aft. I´m still trying to find that out though. It could have been possibly positioned between the Main and Mizzen masts but firing these massive guns in that position would have probably killed the Dahlgren crews from the concussion alone so I don´t think that position to be realistic.
As to the lines and fittings, well, I haven´t come to that bridge, yet. I´m still working on the Hull designs. "Carmike" you said you ordered plans from the Navy? Are they plans for the Susquehanna? I haven´t been able to find any. I only found plans for the Powhatan at Maryland Silver Company. ´The Powhatan was her sister ship but built 2 years later. I´m sure that they were built slightly different. If they are the Susquehanna, let me know where to get them. There are plans of the Susquehanna that exist but they are for a screw steam conversion that never took place. You can tell by the duel stacks and the modified rudder.
That´s about all I have so far on major discrepancies between the actual ship and the models. If anybody needs other details, feel free to ask. I am still doing my research and have tons of questions myself. I want to build this ship as historically correct as I can so that I can say "THIS was the USS Susquehanna. Not "Well this could have been what she looked like but...." I´m still hoping there is someone out there that knows this ship inside and out. It seems to be pretty elusive. I´ve found a lot of first hand accounts form action on the ship but the details seem to be conflicting. I don´t know which to believe.
Here is a very good site for help in ships details such as sails and rigging. They would be happy to help with your questions.
http://shipmodeling.net/vb_forum/
Bill