Round tube & chassis mods... a world of pain?

[dogwood]

Have to agree with Ash here.
Having built to the book, and now doing a full rebuild.
If you alter just one thing, it throws out everything else.
So you will end up reworking every measurement.

As for the tubing you're planning, unless you intend to fit some megga engine.
You are just adding unneccacary weight to the chassis, which it don't need.
As for a 100mm wheelbase extension...You would also need to widen it significantly, and prob raise it some. Otherwise it would look out of proportion.

IMHO of course