I've built machines using the green design and please believe me you have nothing to fear the strength is easily over the top for anything but steel or harder.

If you use Bk/BF blocks then they line straight up with slots so easy fitting. It offers good strong attachment to gantry sides.
Yes it places the ball-screw slightly further back than what's considered ideal but again it's nothing and doesn't make any difference to how machine performs. The positive is the screw is away from the firing line and protected.

Not trying to sell it to you but I know it works with no detrimental side affects and plenty of positives.!!