a long sewer pipe buried in the ground at a slight angle makes for a great bowling ball cannon. 5 lbs of flash powder in the bottom gives a 12 lb ball more than 40 seconds of air time. you can listen to them sing due to the finger holes. they leave a pretty good impact crater in sand when they come down.
on the subject of the lanes: we turned some into an island top and it is really the highlight of our whole kitchen. its beautiful and functional. If you have the room, get some of it for tops, build a dining table even. advise here is correct. no glue, lots of hard ring shank nails to damage your saw blades. Mine had 3 in. angle iron bolted to the bottom to keep it flat. I sawed grooves into the bottom and rabbits for 1/2 angle iron and put a bunch of 1 in #8 screws into it to create structure over our bar area. if you pick up both sides and do not support the center, it can some apart or bend like an accordion. our island top was built of a section with the walnut darts and the matchsticked pine/maple transition. it weighs around 300 lbs for the 5 ft by 6 foot area. it took hours with with a belt sander to remove the thick plastic finish.