I have used the T handle before in various doors and lockers but never used an internal one. I would think you could fit a handle inside too, however these types tend to have a lock in the individual handle so if locked externally you could not exit from inside.

We used a company called Albert Jagger. They do lots of vehicle hardware so it will be worth looking at for some ideas. They were a reasonable price, but we got trade rates. You tend to have to ring or email for prices.
I’ll look them up - thanks.
This is what I’m looking at at the moment.
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Got the lock mechanism from Albert Jagger this morning so did some work on the cat flap.
Made and welded a bracket for the lock, and drilled all the holes for the handle.
Added the rod supports at either side if the frame.
Random fasteners at the moment and the handle fixing bolts need trimming to length but it works in principle.
Next stop, hinges.
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Got the lock mechanism from Albert Jagger this morning so did some work on the cat flap.
Made and welded a bracket for the lock, and drilled all the holes for the handle.
Added the rod supports at either side if the frame.
Random fasteners at the moment and the handle fixing bolts need trimming to length but it works in principle.
Next stop, hinges.
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Looking good. Remember Albert Jagger also do hinges and rubber seals. Unfortunately the seal comes in 50m coils I think, but there are lots of profiles on their site. Sometimes you can find the same profile on ebay.
 
Finished both the upper hinges for ‘project cat-flap’. They were quite tricky to make (for me) so I’ve posted some pics of how I did it.
The original hinges are made from 1.25” x 0.25” but it’s much easier to get hold of 30mm x 6mm so this is what I’ve based these around.
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Some fettling, and I’ve got an offset to the hinges arms that line up with the uprights in the donor door.
The door swings open ok, but currently the top ally skin fouls the underside of the roof gutter so some more fiddling is required.
Progress though. It now looks like it may even be a success.
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I’m enjoying this. Some great skills and off the cuff design going on. Do you think the bent hinges might be a bit springy when the weight of the glass is added in though ??
Edit
Scratch that thought. I forgot that you are putting a gas strut/s in and this should support it eh ?
 
I’m enjoying this. Some great skills and off the cuff design going on. Do you think the bent hinges might be a bit springy when the weight of the glass is added in though ??
Edit
Scratch that thought. I forgot that you are putting a gas strut/s in and this should support it eh ?
Hi Meego and thanks for your comments.
I had considered the weight, especially as they’re only mild steel for the hinges. As you say, I’m thinking that the gas struts will hold the weight when it’s open, and the bolts the same when closed. Fingers crossed :)
 
Been working on the latching mechanism this morning. Fabricated a fixture that receives the locking bolt, that mimics the original series design. Seems to work ok, but needs some movement built in for adjustment. Got to make the opposing one now it works.
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I’m getting some interference between the top of the door frame and the bottom of the gutter as the door is opened, but only on the off-side. My tiny brain cannot work out the required adjustment. I could just lower the door (when closed) but that would adversely affect the shut lines.
Anyone good at adjusting these type of hinged doors?
 

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