Hi Tony.
The pedal box I'm not sure of with the MGF. I used the 200 pedal box and chopped to bits so they are all separate pedals. Used a Rover 600 (TI or diesel) master cylinder. Do you have the bigger fuel tank? If so it's going to be a bugger getting in and out with the master cylinder fitted.
Just on the verge of playing with the gearbox and slave mounting bracket from the MGF. Been told the slave cylinder is identical to a Rover 600 as well. So mine should fit. Though you will need to change the clutch release arm.
I've had a couple of gearboxes that have broken/cracked at the mount on the gearbox. So toying with the gearbox mount from the MGF.
Also used the gear change cables/brackets etc from the MGF. Gearchanges are a lot better now.
Have a look here for hydraulic clutch.
http://www.kitcar.good-hosting.co.uk/dash.htm
And the complete build site though quite a bit out of date. A lot has changed.
http://www.kitcar.good-hosting.co.uk/
The other thing to look out for are the rear brakes. The hubs are too big for the discs so will need machining. Steering arms could do with strengthening on the standard Marlin ones.