hi bp131, thanks for the tip. Actually the type of birch that i've used falls under the same category as appleply. I worked at a shoe manufacturing r/d facility and we had bucks/fixtures made of this kind of wood.
REDDOG, thanks.. i'm trying to come up with something not done before, but at the same time trying to keep it style-wise peroid correct, (from the 20's to the 50's, square gas/oil tanks, sluged frames etc..) It is a challenge and lots of fun..
Thanks Ray,,
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One of the nice features of this oil tank is that it will have an integrated oil cooler.
I bent/welded the sheet to make an air duct


The inside and outside of the oil tank and its air duct is aligned to the gas tank for optimum air movement. pix will come soon showing aerodynamics..
Still rough but you get the idea

More technical info/pix are on my blog.