i think the issue with the above is going to be that you'll need specific ball joints, the mount holes look like they're tapered. It's also going to "fix" your a-arm "height" and steering arm position to what it is. difficult to mod that spindle. The other setup you posted is a little similar to what i did.
I posted a thread about golf cart front and rear setups
http://www.buggymasters.com/forum/showthread.php?t=3029
I picked up a complete cart for less than $100 at the scrap yard and chopped the front and rear suspension and steering setup off it, returned the rest for $30. still have the electric motor and other parts to return for scrap when i'm done. for that price, that's 2 good hubs, rims and spindles you could modify.