Shouldn't be too monstrous a job I wouldn't think. You just need to plan out where they would fix to and how long/short the stroke needs to be to function as required. Places like Maplin and RS do general DIY struts I think, which come pre-gassed and you let out the gas to get the desired operating pressure. Only gotcha is that once the gas is out, there is no going back, so let it out in small stages to fine tune.
Thanks mate top notch advice :) il pop in maplins and see :)