Ceiling height, Raising of

dave9898

Please see attachment for x2 drawings of current situation & what I want to achieve, and x3 photos of existing situation.
I have an enclosed porch that was turned into living space by a previous owner. The roof structure of the porch is original to the house, built 1953. The existing ceiling height is 7'4" and 1/4" plywood.
I want to raise the ceiling height 2', or higher if possible.
my questions:
1) How to firmly tie/affix the angled roof members onto the wall header without the cross joists sitting on the wall header and roof beams holding the wall header and roof beams together. (see drawing attachment)
2) How high can I raise the cross joists up the roofing members before stability is an issue?
3) What is the best way to affix the cross joist members onto the angled roof members -Nails, screws, bolts or stronger with brackets (decking brackets?)?
Thanks in advance
David

redline

Do you have photos?

dave9898

Ran into tech difficulties.
Unsure how to reduce file size small enough so that this site will accept the attachments. Using Acrobat I was able to reduce down to 19.9k but site only accepts 19k or smaller and cannot reduce further.
Do you know another way to reduce or can I e mail you directly?