Doubt it, Box
It took George Kistiakowsy (and friends) a hell of a lot of tests and blown-up pipes.. to get anywhere near a sufficiently uniform implosion - which is the *only* mechanism workable with Pu, for various reasons. And even if you had the several 'velocities' of plastic - you wouldn't have a clue as to arranging their geometry. Not even you.
So unless you had U-235, could use the crummy gun-barrel approach: you'd fail, even by All Saints Day (or whenever that thingie is, about the Prince of Peace and all.) But the world is awash with kilotons of Pu - why you could build the new US Memorial Temple to Dreams of Empire out of solid Pu (if you kept it sufficiently thin so as not to encounter a few other little problems).
Better stick to stickin those pins in those dolls.
Ashton Designer Munitions Gmbh Tu-Th-Sa-Su
Catering on M-W-F
