I've always wanted to go for an infantry heavy Guard army, I like transports too much though
Overall your list looks like a good attempt for what you're trying to achieve. You won't win any tournaments with it but I guess you know that. While I think it's worth trying it as it is I do have some comments:
The first thing that jumps out at me is your lack of anti tank. Maybe upgrade your two
PCS's to a lascannon instead of an autocannon. This certainly won't give you reliable anti tank though.
Linked to the above point, do you really need Wyverns? I know they're one of the best units in the codex, I would spend the points on anti tank options myself though. I'm not sure they add much value to this particular list.
Your anti tank options are basically two Land Speeders. Your opponent will notice this straight away and they won't last long.
I'm not sure that Terminator armour for your Inquisitors is worth it. Personally I'd spend the points on making them psykers. If you are intent on keeping the Terminator armour I'd try and find points for psycannons, definitely worth it.
I'm not sure what your Henchmen are going to achieve. I'd have fewer and load up on more plasma guns. Makes them more dangerous and harder for your opponent to ignore them.