The rockers are very rusty and will need to be rebuilt first, since I can't access them after the rest of the body is lowered down and final welded.
After I finished trimming the Lincoln chassis down to a floorpan, I positioned the body inside the garage and lifted it up with camper jacks and a home-made jig that slid through the body for equal support on both sides. I got this idea from a fellow HAMBer.

I used the "car skates" to roll the Lincoln in, and fine tune its placement from side-to-side.

Here's a shot of the Mercury body with the floor cut completely away. Things were getting scary at this point.

Here- Looking into the trunk, back towards the front of the body. No floor in sight. This was truly a "shell" at this point.
Here are some better shots of the camper jacks, showing how the body was lifted high enough to get the chassis under it. A "poor man's" lift, of sorts.
Little by little, the chassis was moved back, and I started taking measuments to be sure it would all fall into place. I trimmed the Mercury firewall away so that I could re-use a part of the Lincoln firewall where the brakes and pedals all went through.
In this shot, you can see where the two firewalls will come together.
I began to lower the body back down over the chassis.

At this point, the flooring is level with where the old Mercury flooring was. This would be a "stock" height, with no channel. I mocked up the front fender to get an idea of where the wheel will be in relationship to the opening.
4 inch channel. You can see how the Mercury body is very tight to the frame at the front by the firewall. I decided to not go this low.
Here's a view of how the trunk floor lines up at this point. I cut about 8 inches off the trunk floor and about 6 inches of fthe Lincoln frame. It lines up very well, and when finished, it will be a deep trunk like the Lincolns are famous for.
Here's a view of the side if the Merc body was set at the stock Lincoln floor height again. The wheels are a little too exposed in my opinion, the body needs to be a bit lower.

Here is a shot looking back at the rear seat area.

Those two braces from the Merc line up almost exact with the '88 Lincoln package tray braces!
The gaps between the flooring and body will all be welded together with patches.
Here is a view of the firewall after I lowered the body down some more. I began to notice an interference problem with the lower a pillar and the Lincoln frame.A channel job wasn't the best route for my purposes.
I wanted to make sure that with the body this low, the engine would clear the hood. It does, easily.
This should give you an idea of the relationship between the wheels and the fenderwell with a channel. Although it looks "right" I decided to mount the body higher, and modify the suspension later.

You can see the channel in this picture, mostly in the door area. See the frame rail? No good. Too close to body.
Another view of the channel. Would be nice, but I'd rather have an airbag suspension and not have to rework the areas that interfere with the frame.
Lowering the body down low made this area a problem area. The red line shows where the Merc body actually makes contact with the Lincoln frame. The body and the frame widths were only 1/4" different.
Driver's side, looking back.
Here's an overall shot if the body was channeld. I decided against this,

Note how much longer the Lincoln chassis is than the front of the hood!
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Here's a good shot at my "lift".
Pre-welded Lincoln-to-Merc firewall. I'm still at the "positioning" point here.