i imagine doing a 3sfe into the sedan is pretty much the same process as the 3sge, heres what im doing atm,
wife got me early christmas present: sneak peak of what's to come im not going to go into to much detail with the mounthing cause in the category i find different people use different methods, but what i did for the mounts where, i used the c52 rear and right hand mount. i had to modify the mounting plate for the right hand mount to move it backwards inturn moving the transmission forawrd. the front is a celica mount. the cam timing side is a celica mount. both have to be made/customized to fit. since as i said i used the c52 right hand mount i had to also lower the transmission with a 1/2" aluminum block. the important thing when doing this that i stressed the most was leveling the engine and making sure the axles line right.
for axles since the track on most the S series engine cars have a wider track it means they have longer axles. so i grabbed some bolt on axles from a 88' manual camry and used the diff part, i then mated that part to the 84-87 aw11 axles. i dont know how strong this combo is as for hard launching since my car isnt running yet, but its as short as your stock axles. you also get to use an intermediate shaft.
for the shifter linkage, the s5X tranny will have a casted on shim area, you will need to use shift linkages from either the celica year you have or what i did was used the shifter linkages from the 88' manual camry, it uses the same shifter base as the corolla gt-s.
hope this helps a little.