if you were completely stock and running the stock recovery,taking the OTA wouldnt be a big deal,but you cant take it with a custom recovery installed,and i dont know how different skyraider is from stock,but im pretty sure that installing the OTA over top of it wouldnt work out
there should be a file in system/etc/security called otacerts.zip that you can rename or remove. this will let the ota download,but not install.
other options would be in install a different custom rom,or ask in the skyraider thread what other users are doing-maybe there is a better fix.
im pretty surprised that youre getting the prompt,most devs remove everything that could trigger an OTA so you would be safe from getting it.
glad everything worked out for you