yeah i swam over n spyder and circled it on foot too. cold ass water

.
the group i was with took a 500 foot cable and we strung it from the tree at the top of the hill on the box side, then on down to the big boulder where the wall is on the low side.
we took turns riding a pully down the cable and jumping in the water before we would splatter on the wall. big fun.

i have alot of video from those trip as i was riding bitch. well i always have to ride bitch cause i cant afford the time to run my junk out there from detroit
so i know what you mean about not being able to get pics.
as to the spindle holes, you use your grinder in an x pattern to lightly clearance the hole so the welded up shafts will fit through. just try to fit em in and grind where it needs it.
welding real slow and stopping constatly to cool with water or oil quench even
nets a good strong d28 joint, BUT it increases the liklihood of snapping the shaft off in the 23 spline side gear which is usually a bitch to get out. sounds like you guys can handle it though, and you can get a shit ton of them shafts
and lockouts usually for cheap or free. just add joints and mig wire. drill the caps too and grease em with a needle and you can go a ways with a welded 28 and an easy foot.
though you may want to do a brake controller mod intead of welding the diff.