I did this last weekend and it was a super easy job. Sealed everything back up and no leaks anywhere so far.
I also cleaned up the spot in front of the radiator that had coolant remnants from who knows how long ago and have been monitoring it ever since. After 200ish miles of driving no signs of coolant have appeared. I'm starting to think that what I saw was from another time and that maybe the radiator/radiator connection has already been replaced/fixed?
Either way, car is running great and giving me a grin every time I drive it.
2006 ST Exige - GT-28RS, Darton sleeved/decked/line-honed, ARP hardware, Wiseco 8.8:1 pistons, MWR valves/springs/retainers, RC injectors, Walbro pump, CWorx oil pump, Moroso oil pan, S111 TrackMounts, Spearco intercooler, GReddy catch-can, Turbosmart BOV, Fidanza clutch/flywheel CF Panels/scoops, S111 Rear Diffuser/Rear-Panel Delete/discNOIR Brakes w/SS lines/RTDbrace/Towhook, APR CF Splitter Alpine unit w/MBQuart, CF binnacle/shifter, Schroth harness, S111 shift brace (Sold)