My verdict on using titebond on the blocks is that it isn't all that much easier than just mixing up one pump batches of epoxy. It might be marginally easier, but if you have all the blocks prepped and laid out you can just glue, clamp, and clean one batch at a time. I think the fact that epoxy needs lower clamping pressure (no need for C-clamps) might tip the scale in it's favor.
For gluing the inner rail to the blocks I started using epoxy because of how difficult it is to clean the squeeze out from inside the scuppers. A little smear of leftover epoxy won't even be visible, but excess titebond might be a problem when it comes to sealing the wood because epoxy doesn't always like to bond to it.
-colin