You have to take my advice with a grain of salt. I always try to make chicken salad out of chicken poop. You already have a good cyl and splitting beam and you want to add a lift table. What you lack is hp and oil flow. To add a lift table you are going to have to also add a control valve and you say you can weld. Since you will need to add a control valve, buy one with two spools and bigger ports. Cut the ports off the cyl, drill out the barrel and weld on bigger ones. Now find a old riding mower and buy a larger hp engine with electric start. Make your pump mounts and buy a larger pump. Make a bigger oil tank or repurpose a 30lb propane tank. You can find the 30lb propane tanks off a old camper out of date and usually for nothing or very cheap. $2-$300 and you will have a very capable and fast splitter. If you dont want the work, you can always sell what you have and buy something newer, faster, stronger, but you will probably have more in it than what you can fix yours for. Do the work right and match the parts and you can get your splitter down to a 6sec or less cycle time.