with mounts first thing first get the angle grinder out and cut all the old ones of the crossmember. that will take you a couple of hours then grind, sand and paint the cross member.
then i used a s2 rx7 round engine mount rubber. weld on to the chassie rails with the motor in place you might have to use a jack under the engine to get it placed right i.e hight.
you will have to custom make a front crossmeber from the front of the rotar use the rotary cross member and mod that. so it will reach from side to side.
this will take you some time if you do it your self.
there is no easy way or kits made for this.
but it looks like you got some good stuff ther and all for a 2000 model yzf