that engineer is a dickhead
you need an Approval Certificate, possibly not even from an engineer(an approved approver? might have to be an engineer,
but people have used the figure $130 for cert.).
http://www.vicroads.vic.gov.au/Home/Registration/PermitsModificationsAndDefects/Modifications/RemoveAddReplaceSeats.htmReplacing seatsAn Approval Certificate is not required for a replacement seat provided:
* the seat is offered by the manufacturer as an option and is replacing and existing seat
* the original seat mountings are used
* appropriate seat belts are fitted.
An Approval Certificate is required if: * the replacement seat was not offered by the manufacturer as an option
* the vehicle was manufactured on or after 1 January 1969.
Advising VicRoadsIf the modification has changed the seating description of the vehicle or an Approval Certificate is required then you must visit a VicRoads Customer Service Centre with:
* evidence of identity
* the vehicle
* an Approval Certificate, if required.
An appointment is not required.
and check out.....
http://www.google.com.au/search?q=%EF%BB%BF+NATIONAL+CODE+OF+PRACTICE+++STANDARDS+BULLETIN+VSB+5B&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:official&client=firefox-asecond link (first unsponsered link)
NATIONAL CODE OF PRACTICE
STANDARDS BULLETIN VSB 5B
CONSTRUCTION AND INSTALLATION OF
ADDITIONAL SEATS BY INDIVIDUALS
Issue 2.0 - Revision 1.0 - January 2004
Supersedes document dated December 1996
Seats from an Existing Vehicle
A seat from another vehicle may be used as an additional seat in another vehicle, eg the bench
seat from the front of a sedan may be installed in a cargo van to provide an additional seat.
The seat must be attached to the vehicle with at least the same number and size of fasteners as in
the original installation.
Where the seat is installed on a supporting frame to increase the height of the seat above the
floor, the supporting frame must be constructed of rectangular hollow section not less than
25 mm x 25 mm x 2 mm. The construction, including bracing, must be as set out in Figures 4, 5
or 6, depending on the number of seating positions provided by the seat.
Let me know how you go as i have transit van seats in the shed waiting to go in my roofless rusty beddy