I like your approach, If you haven't already, maybe layout out a budget for each aspect of the kart. (Tires-rims, suspension components and shocks, Frame tubes, engine, seats) so you can show your wife the costs and then spread them out over the build timeline to show it on a weekly or monthly cost basis. Right now, BMI is selling through its inventory of leftover Yerf rear swingarms and engines and they have the 22 inch rear tires (not turf tires either!) mounted on rims for $50 ea. The engines have no reverse, but they're selling them for next to nothing but shipping. I'd consider grabbing one of the subframes with an engine that still has the stock Howhit head on it and maybe find a used GY6 shortcase with reverse. You could swap the head and even possibly the howhit gearing in the transmission, put that in the used one with the reverse and have probably the best GY6 combo for the money.
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