Samysam,
I molded the legenday edition helm, it is small. I ended up taking the original mold casted and splitting it down the middle and widening it 1.5 inches ( so it wouldnt throw off the scale to badly.) It now all fits nicely it is still a little shorter then I would like but I am on a time-table with very little spare time.
If your over say 5ft 7 with a head circumfrence of 22 inches I would suggest going a different route. Total cost for my molding project ( for the helm anyway) was $253.00 that was for enough rebound25 to make 2 molds and enough plastic(smoothon 300) to cast 4 helms, the clay(2lbs modella NSP) used to widen it
Here is a link to the 1st helm cast after the widening process, note the back plate is cut off. turns out this was not required so I recast 2 more with back plate attached, it will fit over your head once the helm is widened. when I get back home I will post up pics of the ones casted with the back plate attached so you can see.( on the road for 2 weeks straight dang it.)
Legendary helm pics