Criticism .. . . an LS? I was all excited when you said a 434, then the woody went away when I kept reading, lol, just giving you a hard time.
On the motor mounts, majority of solid engine mounts are done via a mid plate with front plate (mine has both, plus tied in with the factory engine mounts, but my engine block is being used in the power range where block flex/core shift is a big problem and I need all the help I can get) or bracing. With everything they mount too being very stiff, frame/chassis flex is very bad/hard on engine blocks & tranny case's. If you ever get the chance, I'd consider building a mid plate, as the factory mounts aren't very good for resisting torque flex of the powertrain due to being so close to centerline of the powertrain (make sense?). Same goes with the tranny/t-case mount, I couldn't quite see it (I do see a bushing on the t-case output though), but that is also solid mounted, if not, everything needs to be. The chassis flex has the same effect here, excessive chassis flex can case issues with the case on both the tranny and t-case. Also, if one part or the other starts moving/flexing (ie loose tranny mount causing the t-case/tranny to move can result in a cracked bellhousing) it will have effects up or downstream of the problem. That said, if you ever find cracked welds or chassis bits around your powertrain mounts, something is flexing/moving that shouldn't be.
Just a recommendation is all, I'm a little paranoid with solid mounted powertrains, partly because of my setup and the fact I'm running power levels well beyond what my parts were ever meant for (as I said I'm at the point with the engine block & tranny housing that I need to compensate for block & housing flex), and partly because I've seen a lot of cracked bellhousings.