MK IV tubular spaceframe drawing

I have now constructed an alternative variant of the side boxes.
Aluminum plates riveted to the tanks.
Weight saving approx. 16
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kg
 
These two tanks are bigger than we thought.
To make them removable I changed the side boxes again
Thanks to the McLaren group, Udo and Andrew for the great input
Reihe_F_V_10_08.JPG
Reihe_F_V_10_09.JPG
 
Hi ,
I have now completely redesigned my frame. Additionally I have done extensive FEM studies. I have always used 42crmo4 with 800-1000Nm tensile strength as material.
The tubes are 40x40x2 and 25x25x2 mm
Unfortunately I have to realize that there are only round tubes made of this material :(
Now I have only two possibilities to redesign everything with round tubes or to use another material.


Which material could you recommend me?










 
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