I looked through the 2000 Celica GTS manual for the proper torque of the engine mount brackets to the engine/transmission, and I found 3 of the 4 mounts. The manual doesn't mention a front mount for the 2000 Celica, which seems really odd. All cars I have worked on have the usual 4 mounts.
Note that the engine in the Elise is on the same side of the car as it is on the Celica, so right, left, front and rear references between the two are the same.
The torque of these bracket bolts into the aluminum of the engine block and transmission housing is more limited by the aluminum threads rather than the bolt itself.
Here is what I found:
Rear Engine Mount bracket to transmission housing: 47 ft.lbs
Right side engine mount bracket to engine: 36 ft.lbs.
Left side engine mount bracket to transmission housing: 44 ft.lbs
Front: can't find it. If the bracket bolts are the same on front and rear (diameter, thread pitch, and length of thread engagement), I would expect that the torque of the front would be the same as the rear. However, I just don't know if they are the same (I never took off the rear bracket to tranny bolts). If someone has the Corolla or Matrix manuals with the 2ZZ-GE engine and C60 or C64 manual transmission, please look this up. I had estimated 40.5 ft.lbs. in my original post, based on the bolt specification, but it would be 47 ft.lbs. if it was the same as the rear.
Big bolt through center of insualtor:
These are for the 2000 Celica GTS manual transmission, and I don't know if Lotus used the same bolts:
Rear mount bolt through center of insulator: 64 ft.lbs. (I had estimate 69 based on the bolt type)
Left hand mount bolt through center of insulator: 59 ft.lbs.