Wow that certainly is a big ol knife. Very cool. And you are right, there is just something about a big knife. Albeit there is something about a smaller knife too but depends on how yah feel that day. lol.
If it was me I would be thinking about that handle. I like what I call "universal" type handles on knives like the KA-BAR F/U but I would think on something like this you would want something a bit more "curvaceous"

Since you already have a decent cant on the handle I'd put some belly on the grips so that your hand wouldnt be slamming around while swinging it. Kinda like your Keffeler chopper, the handle is designed to be conducive to the function of the knife. If you want a straight type handle I would at least make it more inline with the spine. I am not expert just another knife guy lol.
All that being said unless you had a specific purpose in mind with the handle design. Then I am all ears. Either way, interested. :thumbup: