Pro tanks and evods can be rebuilt, you are just limited to how big a coil you can use, with 28g wrapped on a 1/16 drill bit 1.8 ohms is about as high as I could get with out taking a chance of a short because the coil touched the inside of the coil chamber.
but with 32g I have accidentally made a coil that was over 3 ohms ( had to un-coil it some to get to the 2.2 ohms I was shooting for ).
But it isn't that hard once you get the hang of it, there are a TON of videos on YouTube about evod and pro-tank recoiling.
I tried building a microcoil for my PT2 mini today. On my 3rd try I build one at 2.1 ohm.



