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I started this build with my 9 year old. It was a bit too much for him. I'll be getting back to mine soon. This looks good. I'll keep following.
you should, it's really fun.
btw, is it me, or is this tank really small? 
It was indeed, very small. The M18 was the only TD to really fulfill what the Tank Destroyer Command had in mind when they envisaged a small, swift, heavily armed vehicle that could outmaneuver and kill heavier tanks. The US Army embraced the TD concept rather than deploy a true heavy tank, a position that wasn't reversed until the last weeks of the war, when the Pershing arrived (it had been developed as a medium tank, but it was called a heavy when it was introduced--indeed, it was 50% heavier than a Sherman, so the title seemed appropriate).
Unfortunately, by the time the M18 was ready, the 76 mm gun was already ineffective against the heavier German vehicles. Tests showed it could carry the 90 mm turret from the M36 (though with less ammo onboard), but no conversion program ever took place.
In hindsight, the whole TD concept was too restrictive, since they were intended to be used only against tanks, and had insufficient armor protection for the assault role, and no machine gun under armor to protect themselves against infantry attack. In practice, no divisional commander would keep half of his armor assets in the rear areas awaiting some hypothetical tank breakthrough. So, the tank destroyers ended up being used exactly like tanks, supporting the infantry, and suffered for it. The problem was summed up in a postwar report. What was needed was "not tank killers, but killer tanks." The tank destroyer command was eliminated after the war, as were the vehicles themselves.
There are tank destroyers today, but they are lightweight missile armed vehicles that supplement rather than replace tanks.