(see www,manxnotebook.com/maps/intro.htm)
you can buy my CD ROM (ManxNotebook) that has a large image of Speed's map (drawn 1598 pub 1615) but not much happens in Jurby !
The next detailed map is Smythe 1826 - I've only done santon as an example of that see www.manxnotebook.com/parishes/sn/sm_1826.htm (the complete map is on my list of things to do but my copy is now framed so photography not easy)
Then you have the very detailed 1868/70 O/S which did significant sections at 25inch/mile - I have many of the sheets of this edition so could make available some.

There are tythe plans (from 1840's) Asylum Plans from 1860's - these were merged to form Woods atlas - I have tried to scan these but they need very large images to be useful (a small section of German covering Peel) is on the CD. - The acual plans are held by General registry but fortuneately for their preservation fiches are available at manx museum - they cover indivual farms