1.my level lua is in the meta.xml, like i said ive already loaded 3 models into mta 
2.not sure about syntax error; this is my whole meta.xml and level.lua files: 
 
<meta> 
    <info type="map" version="1.0.0"></info> 
    <map src="gage.map" dimension="0"></map> 
    <settings> 
        <setting name="#maxplayers" value="[ 128 ]"></setting> 
        <setting name="#useLODs" value="[ false ]"></setting> 
        <setting name="#gamespeed" value="[ 1 ]"></setting> 
        <setting name="#minplayers" value="[ 0 ]"></setting> 
        <setting name="#gravity" value="[ 0.008000 ]"></setting> 
        <setting name="#waveheight" value="[ 0 ]"></setting> 
        <setting name="#locked_time" value="[ false ]"></setting> 
        <setting name="#weather" value="[ 0 ]"></setting> 
        <setting name="#time" value="12:0"></setting> 
    </settings> 
    <script src="mapEditorScriptingExtension_s.lua" type="server"></script> 
    <script src="mapEditorScriptingExtension_c.lua" type="client" validate="false"></script> 
    <script src = "gage.lua" type = "client" /> 
    <file src = "moonbeam.txd" /> 
    <file src = "moonbeam.dff" /> 
    <file src = "sultan.dff" /> 
    <file src = "sultan.txd" /> 
    <file src = "shotgspa.dff" /> 
    <file src = "shotgspa.txd" /> 
    <file src = "mecgrl3.dff" /> 
    <file src = "mecgrl3.txd" /> 
     
</meta> 
  
 
 
function replace () 
txd = engineLoadTXD ("moonbeam.txd") 
engineImportTXD( txd , 418) 
  
dff = engineLoadDFF ("moonbeam.dff", 0 ) 
engineReplaceModel( dff ,418) 
  
txd = engineLoadTXD ("sultan.txd") 
engineImportTXD( txd , 560) 
  
dff = engineLoadDFF ("sultan.dff", 0 ) 
engineReplaceModel( dff ,560) 
  
txd = engineLoadTXD ("shotgspa.txd") 
engineImportTXD( txd , 351) 
  
dff = engineLoadDFF ("shotgspa.dff", 0 ) 
engineReplaceModel( dff ,351) 
  
dff = engineLoadDFF ("mecgrl3.dff") 
engineReplaceModel( dff , 192) 
  
txd = engineLoadTXD ("mecgrl3.txd") 
engineImportTXD( txd , 192) 
end 
addEventHandler("onClientResourceStart",getRootElement(), replace) 
 
3. i never actually thought of this, i shall go find a ped spawner and replace the dff/txd in the gta3.img and see what happens, thanks for the suggestions