hey there mate,
yeap sounds like your on your way. Considering you got yourself a motor package out of an ae86, it sounds as though most of the works done for you.
In terms of running the motor, you'll need to have the loom modified to work in the ke70, unsure how this is done, had someone do it for me. You'll need to do some reading, or find someone locally who can help you out.
As well as this, you'll need to organise yourself a fuel system (surge tank, lift pump, pump, fuel filter, efi hoses etc), otherwise, keep an eye out for JDM tanks. Ive got one in my car and it cuts out all the drama of running an aftermarket fuel system. They're not cheap, but for me it was worth the trade off.
You'll need some form of pedalbox, ae71, modified ke70, even seen modified ae92 (i think) ones. A guy on rollaclub has successfully adapted a 86 clutch pedal setup in his keto. All depends what you can get your hands on.
You'll need a gearbox crossmember to suit t50. Seeing as though your buying that kit, i guess you wont need anything actually. The guys who builds them seems like he knows what hes doing so should be a good lil setup.
Im sure theres more you'll require, you'll find these sorts of things take time, and too, you'll find theres always a few little things you dont have that you'll have to get. But having pieced my way through the conversion with a longish motor, your way better of doing what you did and buying straight from another ae86.