MGW has recently redesigned their shifter so that it's different to the one in their instructional video. The bushings are completely different as is the way the top and bottom of the lower box goes together. They include some supplementary directions with the new design bushings, they now recommend bolting the main box to the support arm first, installing the bushings onto the shifter rod, lining all of that up on the lower closure while raising that up to the in-place main box and assembling everything. Working by myself I found it impossible, either the bushings would slip out of place, the rear one usually falling off and rolling somewhere out of reach. Also the main box, already bolted to the support rotates down and rests on the drive shaft so that you have to keep everything aligned on the lower plate with one hand whilst you hold the main box up off the drive shaft with the other.
What I ended up doing was using a bungee cord, hooked between the shifter cup and the rearview mirror inside the car to pull the shift rod up into the upper box and at the same time lifting it off of the drive shaft. The light upward tension on the shifting rod also allowed me to retain the bushing alignment while I climbed back under the car and raised the bottom plate into position. Worked like a charm. I shared this idea with George at MGW and he's going to try it. you could also use some string to do the same thing I suppose. The key is not to apply so much tension that you snap off the mirror, which is designed to give way in the case of contact with an occupant.
I attached some photos to try and explain.
2013 GT Premium Brembo
MGW, Blow Fish, AM Hood Struts
Tinted, Borla Touring AB, ProCal Tune
Full Shelby/Kicker Audio Upgrade