MR2 - FLAT BATTERY -

Just seeking some advice, had a call out. I've damaged / lost the remote fob/key..
 
I've got bathurst 96 MR2.. Battery went flat. Tried jump starting but the alarm & immobiliser wouldnt bugger off, tried the door trick that i've read about but no good. Car wouldnt start.
Trying to get around the immobiliser
 
Is it easy to remove?
 
Located in melbourne.

Locked on, i've lost it over the years. I will have a look tomorrow when i get the chance.
 
As for removing the immobiliser, would it be easy enough to do myself? Is there a step-by-step guide anywhere? :( 

An after market immobiliser generally goes after the ignition wire on the barrel and the lead to the starter motor relay, using relays to stop connections, which would be otherwise made. Normally you would remove the indicator tabs on the collection of black wires coming out of the box to flummox DIY removal. YMMV.  

Nick thanks heaps for your post. Thinking im just gonna get a auto electrician to come out. Was having a play around last night but cant find any leads.
 
Was there not a stock immobiliser on the 1996 bathurst mr2? Its confusing me, as with the battery charged now it sounds like its about to start but it just wont tick over.. and the alarm wont stop going off. Could this be another fault? 

willl have a look. thanks heaps dude. 

I had to unplug the small box next to the accelerator. Charged the battery overnight, dunked it back in. Alarm goes off for 20 seconds... stopped. Opened both doors.. the light switched off (red one near steering wheel) and stayed off.
 
Car started - died. Wouldn't turn. Left it on 'ON' for 10 minutes or so, got impatient. Turned & started. Kicked with the accel to ensure it didnt die. Drove around for 25 minutes before the indicators started playing up. WTF.
 
Havent tried restarting. Weekend car isn;t getting enough TLC :(