...the wheel Drawings for the Mississippi are as mysterious as the boiler Drawings
One of the first issues I see when attempting to visualise an Isometric [or 3D model] with the wheel assembly is each hub has a different number of wheel spokes......
I count 42 & 21 respectively.....so this is a divisible 2:1 ratio.........
In the end elevation view of the 42 spoke in a V pattern, the outer right hand appears to be riveted to another rim, so possibly the 21 spoked hub......as marked up
The attachment of the paddle blades is via the hooked forged bolts....with the hook latching into the next spaced frame spoke......I think the scaling and representation of the hooked bolts belays their real size in relation to the other wheel components
Derek