I'll confine myself to guns for this, since I doubt my own personal, private, fully-automated and nuclear-repowered WWII battlecruiser is gonna happen...
First, lemme point out I'm a southpaw, so that's gonna skew my thoughts a little.
For Sidearms:
Colt 1903/08 .32/.380 new-builds
1928A1 TSMG with light and laser in forend, in both left- and right-hand versions
A left/right (a la Randall) pair of specially redesigned 1911s:
->Para P14.45-type high-cap basic frames
->Slide-stops relocated to under ejection ports
->standard right-hand mags for both (S&A-type ambi mag catches)
->slides and barrels sized from Officer's-length up to 7" Hardballer Longslide, and maybe an 8" "super-longslide", all with traditional bushing barrels, in each of the following calibers:
-9mm Parabellum
-.357Sig
-.40 Super/.40S&W
-10mm Express/10mm Auto
-.45Super/.45ACP
-.50GI
And how 'bout a new run of .44 AutoMags, while I'm dreaming?
For long guns:
->Correct-repro Winchester, Remington and Ithaca trenchguns WITH BAYONET LUGS
->M1 "M2-lookalike" Carbine with repro correct IR sniperscopes
->M1C/D sniper Garands with repro correct Redfield M84 scopes