truck registration questions

[yfz450_0569]

I just bought a truck on 5-17-08 and I planned on getting the truck restored and then go register the truck, change the name on the title and all. I went to the courthouse and they said the registration taxes were gonna be 10% instead of 5% if I did it now. They're not very nice and helpful people there so I thought I'd ask on here. I already tore down my truck to the frame, turns out the frames been cut and welded and some parts bent. How hard is it to register the truck once I have done all the restoration work on it? If I decide to build my own frame, would that be a problem? Thanks for any help.