26" Front wheel, and 20" rear wheel for my new build!?

Here are pictures of the primed Frame

Here are pictures of the Primed Frame.
 

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Nah, I don't think you should have any structural problems because of using the 20" wheel in the back. Think about it - to the bike it's just like you would be riding uphill all the time. As long it takes the added stress it will get from the engine all should be good :D

Just go with the 36t if you want speed, or maybe there is a vendor who sells an even smaller sprocket? I think I personally would not change the bikes pre-planned design just to gain a few mph, but that's me. What kind of speed were you hoping for?
 
Here I actually found time to put things together a little to see how it looks and take a picture. Here are the pictures I took. Tell me what you guys think. The pedals are like 6-10 inches off the ground. To low?
Tell me what you guys think.
 

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Here I actually found time to put things together a little to see how it looks and take a picture. Here are the pictures I took. Tell me what you guys think. The pedals are like 6-10 inches off the ground. To low?
Tell me what you guys think.

I'm curious about just how you are going to use the fork shown in the frame shown? The fork appears to have an 1&1/8 steerer tube and I'm guessing that the frame is made for the old 1 in BMX/Cruiser headset? If you are actually able to use the fork shown, I think the extra height of the long travel fork offsets the amount of clearance you lost using the 20 in. rear wheel. So pedal clearance won't be an issue.

ocscully
 
The frame is in no danger from the lopsided wheels, look over
all welds, and dropout fastening. Tip, want welding cheap ?
Go to a muffler shop, they have torches set up, and usually have some brazing rod on hand. Avoid electric welding bike tubing, the current can alter the metal, making it crack prone.
 
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