So you want a high end sooper dooper printer?
"large allthread framed duel headed printer "
??What is "allthread" ?leadscrews"
??What do you mean by framed?
You are running the olympic 100m before you can crawl.
The makibox heated stage will be sufficient for small ABS prints.
Are you willing to wait perhaps 6-8 months for a makibox delivery?
IMHO these threaded rod construction printers are neat but Rube Goldberg!
Get a solidoodle or build an Ordbot Hadron and get to printing 3D