How hard is it to convert a Leyland to a Round nose front? Is the firewall the same in both cars? What about the panel between the windscreen and bonnet and guard corners (scuttle panel??)

As long as you can weld the hardest parts are:
1. the moral dilemma it will raise with the purists, and
2. sorting the correct body number.

You need all the panels firewall forward. Firewall and scuttle are the same.

beautiful exactly what I was looking for. Thanks!

Check out my build
http://www.ausmini.com/forums/viewtopic.php?t=52628
Been ther done that,

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1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)
2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S