if what we call leucistic is truely leucistic, then it will always be a pure white snake (no pigment at all) . but a super mojave isn't a true leucistic and i've seen some mojavexlesser yellow out so their not true leucistic. so you might be able to get a pattern out of them, i doubt it tho.
and who knows mayb the spider gene will do something crazy with the leucistic genes, donno until you try, we've had surprises before.
but honestly, i would think your not gonna see any spider what so ever.