Frankly Ken, if the nay syers haven't got any better to do than carp then you are best off leaving that forum as there is critique and there is just negative drivvel.
Whats more challenging? Varnishing your seventieth concours car with the same air brush and lacquer that you used on the previous sixtynine, or developing and experimenting continuously with weathering and distressing techniques and trying new materials out?
You bloomin well make what you want Ken and ignore them. I sincerely hope that it isn't jealousy of your skills on their part.
Rene looks pretty good to me! For building techniques, have a look at Emmanuel Nouallier's work and articles in Mil mod (Have a google as well). They will blow you away.