Can't help you w/a cradle, but sounds easily done...allyou need are two parallel padded rails like on a bunk trailer...
Here's what I did to get mine off for bottom and trailer work
Get your materials together; concrete blocks, wood blocks and some 2x4 you'll cut to length to stabilize...
DROP your trailer tongue down as far as it will go, which raises the transom...stack blocks and top w/wood tight under both sides of the transom, then start raising the trailer tongue which will LIFT the transom end off the trailer...w/the trailer jack, get the bow up so water will drain out the back and block the bow up and lower the trailer jack again...your boat is now off your trailer...Pull the trailer out, reblocking as needed to clear the trailer...a good scissors or bottle jack you'll need for this step...see the stabilizer legs under the hull toward the front...most important to keep from droppin' this puppy on your head...be careful, go slow and it'll be off there before you know it...use of stabilizer legs allow you to walk all around in/on the boat too...reverse all to reload boat back onto trailer...a good strong drill-driver and 3" deck screws are REEL handy for this procedure...and be sure stack concrete blocks w/webbing VERTICLE...