Feasiblity of converting a Feltham tram to a centre-entrance design

[NotAgain]

I'm coming to the end of the planning stages of a layout and am looking at rolling stock for a short section of Tramway. I have a deep love for the Feltham trams of London and Leeds, and would like to use them for (at least some) of the rolling stock, but I would like to know about the feasiblity of converting an ordinary Feltham to the centre-entrance configuration of no. 331, one of the prototypes. Is it a matter of rebuilding the bodywork, or is it trickier than that?

 

For reference, the time period for this rebuild to have occurred would be 1960-64, after this tramway purchased part of Leeds' retired tram fleet.

 

Thanks in advance!

[BernardTPM]

A plastic kit is available of that prototype and a with transfers for Sunderland. All the window spacings upper and lower deck are different, so a conversion of and end-door version would be very difficult.

[NotAgain]

Thanks the tip, but I don't think I was clear with my original question, I meant how feasible would it have been to convert a full-size version. Sorry for the confusion, and thanks for the help.

[BernardTPM]

The centre entrace car does still exist as do standard versions, so pictures of them either under construction or undergoing restoration would be useful in exploring that. I would think though in real life it would be almost as easy to start afresh than to rebuild.