Jimi,
Cutting out the cross member and making it removable is what weakens the entire frame, and that is why it is not recommended. Of course if it is left out entirely, the weakened condition is worse. I can't say I agree that this modification improved the SPF design, but rather degraded it.
Additionally, as someone who used to make the frames for Lone Star, you know the trans mount/cross member on the Lone Star is not a structural part of the frame and in fact there is an X member between the frame rails aft of the trans mount that serves that purpose.
The material the frames are made of is more than adequate, if the integrity of the frame is not modified.
What is done is done. I just wouldn't suggest this is a good alternative for a SPF, based on SPF recommendations.
