On an SII/SIIa 109 I would use the front two big bolts on the bulkhead where the windscreen attaches and use boards and straps under the roof in as many places as possible. On an SIII or defender it is trickier and I would leave the bulkhead on and do it seperately leaving the t-pieces, seat box etc on back as one unit.
Is it a SW or a regular?
If it is a SW, I would be so concerned with rust in the t-pieces, I would do it in parts rather than lift as one unit. I did, doors off, roof with sides off, windscreen off, fenders off, pull t-pieces, pull tub, pull fenders, pull bulkhead.
It can be disassembled by two people in a day easy enough.
*not legal advice*