The so-called "Devonwall" proposals, to even-out constituency sizes, would have meant a cross-River Tamar seat.
Jordan Cobb, 16, from Plymouth, jumped into the River Tamar from the Torpoint ferry, near the Cornish shore.
"Having only to come across the water (River Tamar) from Torpoint is very handy for my wife, " he said.
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Jordan Cobb, 16, from Plymouth, jumped from the Torpoint ferry into the River Tamar late on New Year's Eve.
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The cross was lifted into place by three cranes early on Sunday on the Saltash side of the River Tamar.
Jordan Cobb, 16, from Plymouth, Devon, jumped from the Torpoint ferry into the River Tamar at 21:15 GMT on Monday.
Those behind the structure beside the River Tamar at Saltash hope it will help boost the number of visitors to the town.
Torpoint ferries are pulled across the River Tamar on chains and are an important travel link between Plymouth and Torpoint in Cornwall.
Torpoint ferries are pulled across the River Tamar on chains and are an important travel link between Plymouth, Devon and Torpoint in Cornwall.
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Jordan Cobb, 16, from Plymouth, leapt from the Torpoint ferry into the River Tamar between Devon and Cornwall late on New Year's Eve.
The Torpoint Ferry, which is pulled across the River Tamar on chains, is one of the main ways to travel between Devon and Cornwall.
The sprawling estate on the Cornish side of the River Tamar is a handful, with 55 Grade I and II structures and four ancient monuments, four beaches and a deer park.
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