There are other SS100 replicas, or at least "homages" available.
Panther made an alloy bodied version. It wasn't a kit but a fully assembled car. Not as accurate as the Suffolk but they were very expensive when new and yet don't seem to fetch huge prices now.
http://www.classiccarsforsale.co.uk/car-advert/panther/j72/1978/293060/Steadman was another offering, again aluminium bodied and again they don't fetch huge prices.
http://steadmancars.webs.com/I've often thought that with a bit of imagination and not too much expenditure either of the above could be made to look more "correct" and you'd end up with an all aluminium car for far less than the cost of a Suffolk.