Interesting critter. From what I can see - P3, manual gbox, loader subframe completely missing if it ever had one. The front wheels look to be standard 135 pressings, I would expect a solid disc centre if the industrial loader was fitted and they also appear to be inside out. I don't see any power steering rams, should be attached to the top of the kingpins, so check the steering box for exesive wear. It's worth having a look to see if there's a Dowty hydraulic pump in front of the rad. It would be attached to a shaft driven off the front pulley (makes it a pig to change a fan belt!). If that isn't there then it may have never been a loader. Love to know what's on the other end of those hydraulic pipes, do you have a view of the rear?
As an industrialised ag tractor the rear hydraulics are all self contained within the rear casting and were totally separate from the industrial loader system so if the Dowty pump at the front is missing - don't panic.
They originally had a 2 stage clutch, as you depress the pedal it first disconnects the drive to the gearbox to stop forward motion. Further down the travel it then disconnects the drive to the pto and internal hydraulic pump. This means the hydraulics and pto continue to work if you only push down so far and the bite point can be close to the top of travel. If it's had a cheap clutch change it may have had a single plate fitted but I wouldn't worry too much.
The frame looks to be a generic ROPS cage to stop it going completely upside down should it fall over. There are many versions of these out there.
The rear fork lift fitted to the 3 point linkage and was popular in orchards for loading apple boxes.
Yes, the cage mounting is where the Mil loader fits on the 35/135. The 203 had a complete extra subframe fitted from the casting around the rad to right under the back axle.
Rob.