It could be done, but you'll also need to change the drivetrain substantially, as the Eclipse is a front wheel drive car with a transverse engine... you'd either need to do a lot of reworking to make that drivetrain work with the Jeep drivetrain, or else you'd have to use a longitudinal layout.
No.
A Jeep Wrangler has a frame.
What kind of jeep? And wouldn't it be easier to use a 94 jeep on a 97 frame? And why would you want to do that anyway? Serious answer is: Since you posted this in Grand Cherokee I can tell you that these vehicles are made with a unibody so there really isn't anything under them like a frame. But with a torch anything is possible.
Mitsubishi does not make a "jeep." They make a small SUV type vehicle, but it is not a Jeep. Jeep is a brand name. You'll probably want to look for Mitsubishi parts.
No since the J-10 has a wider wheel trac and longer wheel base, but anything is possible with much modification!
No.
A 1999 Jeep Cherokee is an uni-body vehicle. It doesn't have a separate frame.
No, the frame was widened in the YJ to help cure the tippy nature of the Jeep.
No.
No. Mitsubishi is it's own company. Chrysler does not own Mitsubishi. Chrysler owns Dodge, Jeep, Eagle, Plymouth, and Troller.
Chrysler/Dodge/Jeep Vehicles (91-08), Mitsubishi Eclipse (95-99); Caterpillar 3 Series Excavators, 9 Series Loaders, Kubota See link for more applications
A Jeep liberty is an uni body vehicle.