strange roof structure

We would like to open up our living, kitchen and dining but with the amount of load the walls are bearing I am really wondering if it is at
all worth it. We have a tiled roof and alot of underpurlin struts. I am familar with hanging beams and celing joists but dont know what to
do with the underpurlin and ridge beam struts if the walls are removed. Am also aware of the need for structural engineers etc. but want to
get my head around this before we engage the professionals and part with $$$.
The two areas of concern are; Firstly the pantry and pantry wall. There are 5 underpurlin struts and a ridge beam strut around the pantry and
wall.
The second is a strange one...two beams rise up at around 20 degrees from the external walls (Shown in green on the floor plan) and are
supported by an struts resting on top plates. One beam rests on the other where they cross at 90 degrees. Each beam is then supporting an
underpurlin strut closer to the external wall.
One structural engineer mentioned that you can put in addtional underpurlins and place struts wider? Does this sound right and if so it seems
like a big job.
What do I do with the underpurlin stuts if all that is open plan.

Attached Thumbnails http://www.renovateforum.com/attachm...floor-plan.jpg http://www.renovateforum.com/attachm...ams-cross-.jpg



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