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Notes -
The only viable isotopes to use in a gun-type are U-233 bred from thorium and U-235 purified from natural uranium to >90%. The problem is that spontaneous fission can pre-ignite the reaction before the two masses are in the optimal configuration; even-neutron isotopes have a higher rate of spontaneous fission than odd-neutron isotopes and plutonium has a higher rate than uranium, so a little bit of contamination of a uranium core with U-232, U-234 or U-238 is tolerable, but even pure Pu-239 is very hard to use and even a little bit of contamination with Pu-240 (which you will always get if you're breeding it in a reactor) renders it impossible.
I couldn't build an implosion weapon myself with what I know (whereas I could build a gun-type if I had the materials), but with a few years and a well-stocked lab to perfect lens geometry and understanding of the material properties of Pu-Ga alloy it's not that hard AIUI.
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