I got some Divinycell PVC foam to test out - 6mm H60. A bit underwhelmed... not the magic material I thought it would be - flexible, and feels soft wonder why it costs so much more than blue foam or foam core from the Art shop..
The best way I've seen for a home builder to do beams is by Dr Mark Drela of MIT. You need to get low temp prepreg carbon unidirectional and roll over an aluminium tube thats covered with mylar release film. You have to build a makeshift oven but it only needs 275 deg Fahrenheit. You need to bind it with shrink tape before you stick it in. First the outside heatshrink tape tightens, then the epoxy liquifies and the excess soaks into the paper as the carbon fibers get compacted, then the epoxy gels and finally solidifies. http://www.cstsales.com/carbon_prepreg.html
$40 per pound - maybe 7lbs per beam? $280 for hitech carbon beams...
Unfortunately, I dont think they can ship prepreg to Singapore since it needs to be kept refridgerated.
