Hi Dark,
Well,as a ex-Tornado plumber here's my two-penneth worth.
The cockpit of the ECR is basically the same as that of all the other versions,most of the changes being in the back.The weapon pylons are specific to the German & Italian jets so you cant make a RAF or Saudi jet without modifying them.
As for the after market bits.....
dj parkins
And if you need detail shots,check out my sticky here;
Tornado
Mostly all RAF GR1 to GR4 & some F3 stuff.
As for building it OOB,I made a very good 31Sqn one straight off.The cockpit is fairly accurate,the only thing's that let it down in the seats.
One word of caution tho,Make sure you strengthen the undercarraige!!!It's a heavy model & the main mounts are a bit flimsy.Once they break,it's a bugger to set them up again!!!(as I found out to my cost!)
Merv