If you can find a hydraulic table(or similar), really should not be too hard. Just design the whole thing around the hydraulics. The table frame i made was welded together, just a wood top
No need for counter weights, the hydraulics is way strong enough. Even though it was lifting 400kg (800-900pounds) It did this with ease and could definatley lift more.
If you cant find any second hand hydraulic tables you could always settle for a electric hydraulic scissor lift.
Here is one i found on ebay for you, just to give you an idea
1,000 POUND SOUTHWORTH® HYDRAULIC LIFT TABLE | eBay
Hope this helps