Wow... That was an incredibly clean first gen :-\
I think the exo leaves a little to be desired. Functional? For the most part. Could I do better? Probably not, but my skills aren't being questioned or touted ;D
Try 1.75" tube next time (looks more proportional), and work more WITH the body features instead of just throwing it up there. The B-pillar tube could've been brought back just a little and also been parallel with the back of the cab. As it is, it seems out of place in the middle of the B-pillar and slightly a skewed to the back of the cab. Sure, the customer may have designed or thought it out, but it could've been executed a little differently and still made him happy.
It's fairly easy to see in your welds that they are the same as those in question on the F-Toy. They are better here but have fingerprints similar to what is shown on the F-Toy.
I have no dog in this fight, so take it for what it cost ya. Not trying to stir the pot; simply offering a little constructive criticism, as it does seem that you want to improve, and I've seen a lot of Toyota exos from which to compare.