Road bike sizing advice?

Linux Boy

New member
Hi,
I'm building a custom steel frame. I've been having upper back and neck problems on my current road bike. I lowered the seat and it helped a lot, but now i can barely pedal. so my question is: can i make the head tube longer, effectively raising the handlebars? the net result would be, assuming a horizontal top tube, a ridiculously huge frame. What is preventing me from doing this?
 
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