Wot dia is the hornbeam?
Doesnae look a real monster ( althou i know nothing about hornbeam) some tres are worth doing where others arent worth the hassle.
Many trees get tougher as the dry after there dead/cut so could be a bugger of a job
U can buy imitiation alaskans of ebay, i bought mine years ago for around 80 quid.
Been using it quite a bit recently and it needs some TLC, a few bolts need replacing with lock nuts or spring washers always been a bit of a pain at times but getting it fettled up as i use it.
Bloody handy bits of kit and amazing how good a finish u can get with the proper ripping chain.
I bought a cheap aldi chain sharpener grinder and occasionally touch up the chain after 5-10 free hand file sharpens just to make sure all my angles are correct and cutters the same length, just keeps things right.
Wot saws do u have at the moment? U do need a decent sized saw, and it can be hard on them and ur not long going throu ur combi can either.
U lose roughly 6ish inch of ur bar length the way the mill attach's, althou if u took ur dogs of u'd sneak and extra 2" or so.
Do u have access to other bits of timber to plank?
If purely just for that 1 tree and u'd need to buy a bigger saw just for the 1 job ur far cheaper getting the boy in at 450 quid.
But if u will always have access to odd bits and will find a use for them and have a saw big enough, a cheap mill would be well worth a punt.
If ur saws borderline for size u can get low pro bars which are a narrower kerf/narrower cutters so smaller saws can pull longer bars/chains, u could even get a skip tooth chain, only has 1/2 the teth of a normal chain so again a smaller saw can pull a longer chain, bizzarely more expensive than normal chain.
Also if u try to always have ur logs on a slope and plank downhill, gravity will help it move, if u dont set up a winch
It is a lot of work and the timber can be bloody heavy to move when u start cutting thicker boards, also can be stourey/dusty work often with ur face always near the exhaust fumes
H will likely have quite a few saws all be well over 1K nowadays, possibly a proper alasjkan or panther mill which are serious money too, a heap of bars and chains. If goning hard all day with a 880 or 660 could easy get throu 10 if not 15L of petrol, 30 quid just like that