The are a lot of options with respect to what goes in the car and where you decide to locate it. One of the most important first steps in your build is budgeting for space. The chassis appears to have lots of space but once you start putting an engine, transaxle etc. in, it fills up quickly. This page will outline the key systems that you need to install and where, in general terms, you might consider installing them. The best approach is to have everything on hand before installing or to make mock pieces out of card board

.The following parts are ordered roughly by from largest to smallest


Part  Comment Rear 
Radiator Installed at factory. At least once person has moved to the rear to make a trunk (Frunk?)  
Battery Can also be installed in tail  
Power Cell Small, but impacts how electrical is run  
Sway Bar    
Brake & Clutch Reservoirs Normally mnounted on the drivers side of the rad extension aluminum   
Brake Lines These are CNC-formed and should be taped into position before installing anything. If you add pressure switch ports, plan for them ahead of time.  
Lift Kit Normally mounted in the space between the chassis and radiator, the pump and reservoir (and lines) need to be mapped out ahead of time.  


Part  Comment 
Engine  Use the factory mounts- don't try to move it to "fix" CV joint angle- it isn't needed. Plan for the intake and exhaust routing, and design wiring to keep away from hot exhaust. 
Transaxle  Plan exhaust very carefully so it doesn't heat up the transaxle, design routing for shift cables for minimum bend radius and comprehensive insulation for the shift cables. 
Oil Tank Required for dry-sump systems. Usually on the passenger side of the car as that's the side where the dry sump pumps and pans usually have their fittings.
Swirl pot Best installed on the side of the car where the engine fuel rail fitting is located. The rail can be flipped to reverse the fitting location if needed.
Fuel Filters & Pumps You need two of each. Locate them so the gauges you fit on them (if you do) are visible when the body is mounted.
Power Cell Small, but impact how electrical is run. You need access to the powercell to change fuses, and it needs to be able to be seen to verify the LED status, essential for troubleshooting.
Engine fuse box Needs to be accessible to change fuses, and protected from debris and water (so don't, for example, mount it in front of an open tire). Also, keep away from exhaust