I would also like to reinforce the firewall but because the GP stik is an ARF, it may require major surgery to do so. Any suggestions or does anyone know where I can see pictures on how to reinforce? Another question....when assemling your tank, do you use tygon gas line to connect the brass nipple to the clunk? My experience with tygon is that it gets stiff real quick w/c may hinder clunk movement while in flight, what does most people use? Again, thanks very much, this has been very informative, I appreciate all the info.