Awesome project.. (y) Gr8. Masha Allah.. may God help you complete it successfuly..
Since you're doing an all motor project.. it depends what kind of an engine bay have you made.. e.g. people have put in H22 in Charade.. but for that alterations were made to the engine bay.. you need to decide on your motor first and then make the engine bay and engine mounting according to that..
Buttt.. since you've already done that part, covered through the engine bay & mounting, i'm assuming you've already decided and probably procured the engine as well.. if not, decided the engine, but are done with the engine bay.. then i guess you need to evaluate all possible options that can be placed in the engine bay that you've made... maybe even list them down here so More experienced members here can suggest you something better..
Take it from me, learning from others' experiences is better than going through your own and learning the hard way..
One query? is this going to be your daily runner.. or a total project car for the track? Since you're going all motor, i'm assuming this'll be a daily driver as well.. think twice before chosing the engine and putting in the suspension.. building is one step.. step 2 and bigger step would be maintaining and affording it as a daily runner..
All the best with your project mate..!!