  We study the implications of Lorentz symmetry for hadronic structure by
formulating a manifestly covariant constituent quark model and find full
covariance for any Lorentz transformation requires utilizing a variable
quantization surface. Even though time-reversal invariance mandates a unique
orientation for the surface's direction, we investigated alternative choices
and find small numerical sensitivity to different directions. We also calculate
the static properties of the low lying pseudoscalar mesons and compare results
with existing noncovariant calculations. We conclude that there is a little
sensitivity of the calculated observables to the choice of the formalism,
provided relativity is properly implemented.
