Argh! Just wrote an indepth reply & had it disappear into cyberspace! Very basically....
You'll get a heap out of Pete's DVDs and yes, I think visiting a knackery for some cadaver hooves is a great idea. Allows you to practice, experiment & compare without hurting anyone! If you can, get the knackery guys to use their saw to halve some of the hooves(**** hard to do by hand!), so you can see the coffin bone, hoof capsule, etc in profile.
It appears from the cracks, ridges, etc, that diet/nutrition are or were a prob. safergrass.org is one site that springs to mind re feeding lami prone horses, and FeedXL.com is a fantastic(& very affordable) service/program that I personally subscribe to, which will help you analyse & work out correct nutrition for him. On that note, I'm not sure if they're functioning properly for other countries besides Australia yet(they're new) but if not, I'm sure there are other similar programs or services around.
The front half of his feet are excellent - the walls have been rolled/relieved right back to the damaged laminae which will allow them a chance to grow down strongly. You need to continue that back further to the rear of the quarters tho, instead of to where the overgrown bars & heels meet.
His bars need to come down to near sole level pretty desperately IMO. You're right that his heels are also too long too, but also right to take this gradually. Just lower them bit by bit & play it by ear. If at some point it makes him more sensitive on rough/hard ground on his weak heels, allow them to stay a tad longer than that until his digital cushions strengthen. Frog support pads or 'Sole Guard' or such would help in the meantime.
Lateral balance is hard to assess from these pix, but it does seem that the outsides of his rears at least are a little longer.
Sorry I no longer have time for more detail now.