Basic specs would be something like
Weight: 6 tons
Power: 63kW
Armour: 0-7mm
Height: 2.6m+
armamement: up to 2-pounder for maneuver warfare, up to short version of 18-pounder gun for mobile pillbox role
Overall, better mobility (although still slightly worse than Ha-Go), and seriously inferior to Ha-go in all other aspects.
P.S. 25-pounder gun (even with short barrel and reduced powder charge) would be impossible for Loyd carrier derived vehicle. Too strong recoil on too light chassis will either topple vehicle at low elevation or break suspension at high elevation. The 1954 year derivative of Loyd carrier - CATI 90 which had gun similar to 25-pounder was specifically designed to place gun very low and have limited elevation, so overturning torque is reduced and weak suspension is less loaded. And i am not sure if even all these tweaks have made CATI 90 to survive recoil of more than few shots.
It is common line of thought for amateur to try to fit most powerful armament to the lightest possible chassis, and generally it is wrong. Best combat efficiency is achieved with weapon which hit, not with weapon which produce largest crater a hundred meters off target. Also, the general efficiency of artillery against "soft" targets is reverse proportional to gun caliber.