Question on declarative scripting: Concatenate two patsubst

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Dear All,
I try to learn  makefile language. I  want launch  a tools using make.

On the RAW folder  I have my input file (R1 and R2)
My tool need  2 input files and I prepare using patsubst. Here an example of 
input file


RAW/290_CGATGT_L001_R1_001.fastq.gz RAW/300_CCGTCC_L001_R2_001.fastq.gz

I want to obtain this command:
                                         $(RFILES)                              
                                          $(OUTFILE)                            
                        $(OUTKAL)
       kallisto -i  RAW/290_CGATGT_L001_R1_001.fastq.gz -2 
RAW/300_CCGTCC_L001_R2_001.fastq.gz > 300_CCGTCC_L001.sam


So this is where I arrived. I have able t create  all 3 parameter but I'm not 
able to run on one directive.

RDIR=RAW
OUTDIR=FINAL
RFILES:=$(wildcard $(RDIR)/*_R1_001.fastq.gz)

OUTFILE=$(patsubst %_R1_001.fastq.gz,%_R2_001.fastq.gz,$(RFILES))
OUTKAL=$(patsubst $(RDIR)/%_R1_001.fastq.gz,$(OUTDIR)/%,$(RFILES)) 
.PHONY: clean all 

all: $(OUTFILE) $(RFILES) $(OUTDIR) $(OUTKAL)
$(OUTFILE): $(RFILES)
    -echo $<  $@    

$(OUTKAL):$(RFILES) $(OUTFILE)
   -echo  "mitico -i "  $<"  -"  " >"  $@ 



$(OUTDIR):
    mkdir -p $(OUTDIR)


clean::
    $(RM) -rf $(OUTDIR)

Could you help me please?
thanks so much for any help!