The LED conversion is easy if your good with a solderign iron... I was the first person in the UK to do this with my Megane as they are the same. The LEds are Available from RS they are about £7.25 for 5 and you need ebtween 15/25 Leds depending what model yours is as they used more on the earlyer ones. If you chaneg teh clusters over the Milage will BE WRONG, the milage is stored on the Clocks....
Looks well
We do the red pointers now so they look like the VW Golfs this is more tricky, a mate of mine who does them with me hates it LOL, Any advice just Pm me