Shortening a 110 hardtop

I'd like to shorten the hardtop-not the body- on my 110 ex Military. This is to fit an Ifor Williams roof which is for a 90. I can then have a pick-up rear end or fit the IW roof when needed. Has anyone done this, or knows a site for designs & hints?
Thanks for any help, tips, sensible suggestions, sarcastic comments & downright rudeness X

Ask in the tratter section over ere if yer don't get many replies:

https://www.landyzone.co.uk/forum/defender-90-110-130.7/