There is a bunch of stuff going on in the center tunnel to keep things from chafing. There should be rubber panel grommets at each hole for the hard tubes front and rear. The small split hoses go around the tubes for the heater and the chargecooler (if equipped) to keep them from rubbing through and rattling on the bottom of the tunnel. There should be a bit of trim around the inside diameter of the opening for the oil cooler hoses at the front of the chassis. The rear opening is rounded to protect the hoses. There is also a bulkhead inside the tunnel forward of the gearshift. There should be some sheet rubber cable tied to the oil cooler hoses to protect them as they pass through this bulkhead. I cable tie the oil hoses to the radiator coolant tubes to keep the oil hoses from getting fouled by the shifter. It helps to have 3 elbows to install all of this stuff.
'83 Esprit Turbo (The Fabulous Trashwagon)
'87 Esprit Turbo (FrankEnSPRIT)
'90 St Tropez Turbo
'04 Boxster S
'05 CO Elise, LSS, Touring, Hardtop, among others