Well, whenever you invest in something, you lose out in something else you could level instead.
If you also are fine with being none too good with social interaction, though, which uses the same attribute as Psi, you'll probably have plenty of points.
2 weapons + crafting is feasible.
Now if you want weapons, crafting, sneaking, and some traps, and everything preferable at a high level, you'll come up short, but what you seem to plan is inherently doable.