Looking great so far but as always I have a few suggestions.
First the shin plates seem a little weedy. They may be just what you want and/or scaled to the FW model and really it's your unit so you can do what you want but I honestly think they should be a fair bit larger. They mainly look like they end to soon before the toes and as much as it might seem odd to present a bigger target with the sort of ceramite blend laminate titan armour uses larger plates dissipate energy far better and they cut down on the resonation of hits so larger shin plates would make the legs tougher in prolonged combat and better for kicking tanks like soccer balls.
The "pelvis" narrowing is great. Full compliments on this of course cause you turned a glaring visual annoyance into a purposeful mechanical beauty. I would still like to see the big actuation pistons on it that at least suggest a sort of "hip" flexibility which is something that is soooo important to balance robots that can't flex in their hips effectively never have a chance to actually walk.
The rest of it looks pretty good. I'd like to see how you are making the weapons switchable since you mentioned doing other weapons to a total of 5 so I doubt you are building 2.5 warhounds. I'm planning ahead of time to make my weapons "modular" for when I get two Mars Patterns for my Iron Warriors since at FW's price I wanna have as much bang for my buck as possible and also I'm working on designing a Warlord on the idea of it being a very modular kit with a base chassis then armour and icon detailing separate and weapons completely modular to the point you can build one Warlord and then kit it out exactly as you want then add any of the weapon types to your arsenal so it can fulfill any Warlord config role. I have a number of ideas if you are still thinking how to do it on your warhound or if you just wanna talk modular systems.
Also nice rally car pics in the background. : 3