The similarity in looks aside, Ruger's Mini-30 will never be the equivalent to an M-14 no matter what you do to it. The 7.62x39 round just won't allow for that.
Myself, I'd ditch the scope 'n bayonet idea and just let it be what it is...A handy, light weight, quick handling carbine that is relatively cheep to feed....you know, kinda-sorta like the old M1-Carbine only with a bit more range (and a lot more punch).
Mine came the factory synthetic stock but I found that it made it much too muzzle heavy, so I switched it out for an old-school curved-butt wood stock and added one of those steel "skull-cracker" butt plates. Now the balance is just about perfect. It's undoubtedly heavier than a synthetic-stocked gun but the improved balance actually makes it feel lighter....Note too, the 1-1/4" sling set up, which also helps.....Strictly business, no fluff.
DGW