Is it possible to make bigger parts such as front loader door seals with this process ?
Yes as long is it fits into the pressure pot. One thing to keep in mind a mold the size of a front loading door boot will probably cost at minimum $700 to make and unfortunately molds fail occasionally and you have to do it all over. I was making the 1961-1962 Frigidaire detergent cap and had a mold failure which means I had to do it all over, thankfully the 2nd attempt worked.