i only have to say at this point that i use a custom frame and fork made from cromo since half a year now,and it held up great.
forks weigh 1010g and frame 2020g,(full bike 11,56kg)i am 90 kilos heavy and do a lot of practising to-front stuff etc.
cant complain about.using dh parts mostly for the cranks and steering(holzfeller,syntace,blk mrkt),so my statement doesnt fit quite 100%ish in this topic,
but for marino products theres not a weight-,nor a stability problem.
but to say something completely on-topic,if one doesnt buy pure comp trials components,theres alot of choice of products that are longlasting,i.e. street handlebars or syntace stems etc...