Regarding your stock design, there was an article some years ago in Gun Digest that outlined ultralight straight-stocked rifles {not fullstock however}. I will look for it as I think I have it somewhere. Point is, there is no technical reason you couldn't do what you want to do.

My only question would be the action type desired. I highly respect and enjoy the 98 action but it is heavy and not particularly sleek, and for what you are describing another option, a better option in my opinion, would be a small-ring Swedish 96/46 or even better yet a "strengthened" 46, either of which I think would be very nice {the latter of which I think would be perfect}, as would the Swedish/Norwegian 6.5x55 for a chambering, though the other 6.5 cartridges you describe are really superb in their own right.

I own a Husqvarna Model 46 {96-type action, built 1942} with original HVA peep sight in 9.3x57 that weighs 5 1/2 lbs on my fish scale and is an absolute delight to carry and very easy to shoot due to some stock mods I made to it. Even with the 24 inch barrel the thing is an ultralight and the best bearhounding gun I can imagine. Your rifle concept sounds like a dandy and I see no reason why you couldn't put in walnut and steel what you describe in cybertype!